## 0.5.5 (Unreleased)

__BACKWARDS INCOMPATIBILITIES:__
  * driver/docker: The `load` configuration took an array of paths to images
    prior to this release. A single image is expected by the driver so this
    behavior has been changed to take a single path as a string. Jobs using the
    `load` command should update the syntax to a single string.  [GH-2361]
    
IMPROVEMENTS:
  * core: Handle Serf Reap event [GH-2310]
  * core: Update Serf and Memberlist for more reliable gossip [GH-2255]
  * api: API defaults missing values [GH-2300]
  * api: Validate the restart policy interval [GH-2311]
  * api: New task event for task environment setup [GH-2302]
  * api/cli: Add nomad operator command and API for interacting with Raft
    configuration [GH-2305]
  * cli: node-status displays enabled drivers on the node [GH-2349]
  * client: Apply GC related configurations properly [GH-2273]
  * client: Don't force uppercase meta keys in env vars [GH-2338]
  * client: Don't exec `uname -r` for node attribute kernel.version [GH-2380]
  * client: Artifact support for git and hg as well as netrc support [GH-2386]
  * client: Add metrics to show number of allocations on in each state [GH-2425]
  * client: Reproducible Node ID on OSes that provide system-level UUID
    [GH-2277]
  * driver/docker: Add support for volume drivers [GH-2351]
  * driver/docker: Docker image coordinator and caching [GH-2361]
  * jobspec: Add leader task to allow graceful shutdown of other tasks within
    the task group [GH-2308]
  * periodic: Allow specification of timezones in Periodic Jobs [GH-2321]
  * scheduler: New `distinct_property` constraint [GH-2418]
  * server: Allow specification of eval/job gc threshold [GH-2370]
  * server/vault: Vault Client on Server handles SIGHUP to reload configs
    [GH-2270]
  * telemetry: Clients report allocated/unallocated resources [GH-2327]
  * template: Allow specification of template delimiters [GH-2315]
  * template: Permissions can be set on template destination file [GH-2262]
  * vault: Server side Vault telemetry [GH-2318]
  * vault: Disallow root policy from being specified [GH-2309]

BUG FIXES:
  * core: Handle periodic paramaterized jobs [GH-2385]
  * core: Improve garbage collection of stopped batch jobs [GH-2432]
  * api: Fix escaping of HTML characters [GH-2322]
  * cli: Display disk resources in alloc-status [GH-2404]
  * client: Drivers log during fingerprinting [GH-2337]
  * client: Fix race condition with deriving vault tokens [GH-2275]
  * client: Fix remounting alloc dirs after reboots [GH-2391] [GH-2394]
  * client: Replace `-` with `_` in environment variable names [GH-2406]
  * client: Fix panic and deadlock during client restore state when prestart
    fails [GH-2376] 
  * config: Fix Consul Config Merging/Copying [GH-2278]
  * config: Fix Client reserved resource merging panic [GH-2281]
  * driver/docker: Fix Docker 1.13 on Windows [GH-2342]
  * server: Fix panic when forwarding Vault derivation requests from non-leader
    servers [GH-2267]

## 0.5.4 (January 31, 2017)

IMPROVEMENTS:
  * client: Made the GC related tunables configurable via client configuration
    [GH-2261]

BUG FIXES:
  * client: Fix panic when upgrading to 0.5.3 [GH-2256]

## 0.5.3 (January 30, 2017) 

IMPROVEMENTS:
  * core: Introduce parameterized jobs and dispatch command/API [GH-2128]
  * core: Cancel blocked evals upon successful one for job [GH-2155]
  * api: Added APIs for requesting GC of allocations [GH-2192]
  * api: Job summary endpoint includes summary status for child jobs [GH-2128]
  * api/client: Plain text log streaming suitable for viewing logs in a browser
    [GH-2235]
  * cli: Defaulting to showing allocations which belong to currently registered
    job [GH-2032]
  * client: Garbage collect Allocation Runners to free up disk resouces
    [GH-2081]
  * client: Don't retrieve Driver Stats if unsupported [GH-2173]
  * client: Filter log lines in the executor based on client's log level
    [GH-2172]
  * client: Added environment variables to discover addresses of sibling tasks
    in an allocation [GH-2223]
  * discovery: Register service with duplicate names on different ports [GH-2208]
  * driver/docker: Add support for network aliases [GH-1980]
  * driver/docker: Add `force_pull` option to force downloading an image [GH-2147]
  * driver/docker: Retry when image is not found while creating a container
    [GH-2222]
  * driver/java: Support setting class_path and class name. [GH-2199]
  * telemetry: Prefix gauge values with node name instead of hostname [GH-2098]
  * template: The template block supports keyOrDefault [GH-2209]
  * template: The template block can now interpolate Nomad environment variables
    [GH-2209]
  * vault: Improve validation of the Vault token given to Nomad servers
    [GH-2226]
  * vault: Support setting the Vault role to derive tokens from with
    `create_from_role` setting [GH-2226]

BUG FIXES:
  * client: Fixed namespacing for the cpu arch attribute [GH-2161]
  * client: Fix issue where allocations weren't pulled for several minutes. This
    manifested as slow starts, delayed kills, etc [GH-2177]
  * client: Fix a panic that would occur with a racy alloc migration
    cancellation [GH-2231]
  * config: Fix merging of Consul options which caused auto_adverise to be
    ignored [GH-2159]
  * driver: Fix image based drivers (eg docker) having host env vars set [GH-2211]
  * driver/docker: Fix Docker auth/logging interprelation [GH-2063, GH-2130]
  * driver/docker: Fix parsing of Docker Auth Configurations. New parsing is
    in-line with Docker itself. Also log debug message if auth lookup failed
    [GH-2190]
  * template: Fix splay being used as a wait and instead randomize the delay
    from 0 seconds to splay duration [GH-2227]

## 0.5.2 (December 23, 2016)

BUG FIXES:
  * client: Fixed a race condition and remove panic when handling duplicate
    allocations [GH-2096]
  * client: Cancel wait for remote allocation if migration is no longer required
    [GH-2097]
  * client: Failure to stat a single mountpoint does not cause all of host
    resource usage collection to fail [GH-2090]

## 0.5.1 (December 12, 2016)

IMPROVEMENTS:
  * driver/rkt: Support rkt's `--dns=host` and `--dns=none` options [GH-2028]

BUG FIXES:
  * agent/config: Fix use of IPv6 addresses [GH-2036]
  * api: Fix file descriptor leak and high CPU usage when using the logs
    endpoint [GH-2079]
  * cli: Improve parsing error when a job without a name is specified [GH-2030]
  * client: Fixed permissions of migrated allocation directory [GH-2061]
  * client: Ensuring allocations are not blocked more than once [GH-2040]
  * client: Fix race on StreamFramer Destroy which would cause a panic [GH-2007]
  * client: Not migrating allocation directories on the same client if sticky is
    turned off [GH-2017]
  * client/vault: Fix issue in which deriving a Vault token would fail with
    allocation does not exist due to stale queries [GH-2050]
  * driver/docker: Make container exist errors non-retriable by task runner
    [GH-2033]
  * driver/docker: Fixed an issue related to purging containers with same name
    as Nomad is trying to start [GH-2037]
  * driver/rkt: Fix validation of rkt volumes [GH-2027]

## 0.5.0 (November 16, 2016)

__BACKWARDS INCOMPATIBILITIES:__
  * jobspec: Extracted the disk resources from the task to the task group. The
    new block is name `ephemeral_disk`. Nomad will automatically convert
    existing jobs but newly submitted jobs should refactor the disk resource
    [GH-1710, GH-1679]
  * agent/config: `network_speed` is now an override and not a default value. If
    the network link speed is not detected a default value is applied.

IMPROVEMENTS:
  * core: Support for gossip encryption [GH-1791]
  * core: Vault integration to handle secure introduction of tasks [GH-1583,
    GH-1713]
  * core: New `set_contains` constraint to determine if a set contains all
    specified values [GH-1839]
  * core: Scheduler version enforcement disallows different scheduler version
    from making decisions simultaneously [GH-1872]
  * core: Introduce node SecretID which can be used to minimize the available
    surface area of RPCs to malicious Nomad Clients [GH-1597] 
  * core: Add `sticky` volumes which inform the scheduler to prefer placing
    updated allocations on the same node and to reuse the `local/` and
    `alloc/data` directory from previous allocation allowing semi-persistent
    data and allow those folders to be synced from a remote node [GH-1654,
    GH-1741]
  * agent: Add DataDog telemetry sync [GH-1816]
  * agent: Allow Consul health checks to use bind address rather than advertise
    [GH-1866]
  * agent/config: Advertise addresses do not need to specify a port [GH-1902]
  * agent/config: Bind address defaults to 0.0.0.0 and Advertise defaults to
    hostname [GH-1955]
  * api: Support TLS for encrypting Raft, RPC and HTTP APIs [GH-1853]
  * api: Implement blocking queries for querying a job's evaluations [GH-1892]
  * cli: `nomad alloc-status` shows allocation creation time [GH-1623]
  * cli: `nomad node-status` shows node metadata in verbose mode [GH-1841]
  * client: Failed RPCs are retried on all servers [GH-1735]
  * client: Fingerprint and driver blacklist support [GH-1949]
  * client: Introduce a `secrets/` directory to tasks where sensitive data can
    be written [GH-1681]
  * client/jobspec: Add support for templates that can render static files,
    dynamic content from Consul and secrets from Vault [GH-1783]
  * driver: Export `NOMAD_JOB_NAME` environment variable [GH-1804]
  * driver/docker: Docker For Mac support [GH-1806]
  * driver/docker: Support Docker volumes [GH-1767]
  * driver/docker: Allow Docker logging to be configured [GH-1767]
  * driver/docker: Add `userns_mode` (`--userns`) support [GH-1940]
  * driver/lxc: Support for LXC containers [GH-1699]
  * driver/rkt: Support network configurations [GH-1862]
  * driver/rkt: Support rkt volumes (rkt >= 1.0.0 required) [GH-1812]
  * server/rpc: Added an RPC endpoint for retreiving server members [GH-1947]

BUG FIXES:
  * core: Fix case where dead nodes were not properly handled by System
    scheduler [GH-1715]
  * agent: Handle the SIGPIPE signal preventing panics on journalctl restarts
    [GH-1802]
  * api: Disallow filesystem APIs to read paths that escape the allocation
    directory [GH-1786]
  * cli: `nomad run` failed to run on Windows [GH-1690]
  * cli: `alloc-status` and `node-status` work without access to task stats
    [GH-1660]
  * cli: `alloc-status` does not query for allocation statistics if node is down
    [GH-1844]
  * client: Prevent race when persisting state file [GH-1682]
  * client: Retry recoverable errors when starting a driver [GH-1891]
  * client: Do not validate the command does not contain spaces [GH-1974]
  * client: Fix old services not getting removed from consul on update [GH-1668]
  * client: Preserve permissions of nested directories while chrooting [GH-1960]
  * client: Folder permissions are dropped even when not running as root [GH-1888]
  * client: Artifact download failures will be retried before failing tasks
    [GH-1558]
  * client: Fix a memory leak in the executor that caused failed allocations
    [GH-1762]
  * client: Fix a crash related to stats publishing when driver hasn't started
    yet [GH-1723]
  * client: Chroot environment is only created once, avoid potential filesystem
    errors [GH-1753]
  * client: Failures to download an artifact are retried according to restart
    policy before failing the allocation [GH-1653]
  * client/executor: Prevent race when updating a job configuration with the
    logger [GH-1886]
  * client/fingerprint: Fix inconsistent CPU MHz fingerprinting [GH-1366]
  * env/aws: Fix an issue with reserved ports causing placement failures
    [GH-1617] 
  * discovery: Interpolate all service and check fields [GH-1966]
  * discovery: Fix old services not getting removed from Consul on update
    [GH-1668]
  * discovery: Fix HTTP timeout with Server HTTP health check when there is no
    leader [GH-1656]
  * discovery: Fix client flapping when server is in a different datacenter as
    the client [GH-1641]
  * discovery/jobspec: Validate service name after interpolation [GH-1852]
  * driver/docker: Fix `local/` directory mount into container [GH-1830]
  * driver/docker: Interpolate all string configuration variables [GH-1965]
  * jobspec: Tasks without a resource block no longer fail to validate [GH-1864]
  * jobspec: Update HCL to fix panic in JSON parsing [GH-1754]

## 0.4.1 (August 18, 2016)

__BACKWARDS INCOMPATIBILITIES:__
  * telemetry: Operators will have to explicitly opt-in for Nomad client to
    publish allocation and node metrics

IMPROVEMENTS:
  * core: Allow count 0 on system jobs [GH-1421]
  * core: Summarize the current status of registered jobs. [GH-1383, GH-1517]
  * core: Gracefully handle short lived outages by holding RPC calls [GH-1403]
  * core: Introduce a lost state for allocations that were on Nodes that died
    [GH-1516]
  * api: client Logs endpoint for streaming task logs [GH-1444]
  * api/cli: Support for tailing/streaming files [GH-1404, GH-1420]
  * api/server: Support for querying job summaries [GH-1455]
  * cli: `nomad logs` command for streaming task logs [GH-1444]
  * cli: `nomad status` shows the create time of allocations [GH-1540]
  * cli: `nomad plan` exit code indicates if changes will occur [GH-1502]
  * cli: status commands support JSON output and go template formating [GH-1503]
  * cli: Validate and plan command supports reading from stdin [GH-1460,
    GH-1458]
  * cli: Allow basic authentication through address and environment variable
    [GH-1610]
  * cli: `nomad node-status` shows volume name for non-physical volumes instead
    of showing 0B used [GH-1538]
  * cli: Support retrieving job files using go-getter in the `run`, `plan` and
    `validate` command [GH-1511]
  * client: Add killing event to task state [GH-1457]
  * client: Fingerprint network speed on Windows [GH-1443]
  * discovery: Support for initial check status [GH-1599]
  * discovery: Support for query params in health check urls [GH-1562]
  * driver/docker: Allow working directory to be configured [GH-1513]
  * driver/docker: Remove docker volumes when removing container [GH-1519]
  * driver/docker: Set windows containers network mode to nat by default
    [GH-1521]
  * driver/exec: Allow chroot environment to be configurable [GH-1518]
  * driver/qemu: Allows users to pass extra args to the qemu driver [GH-1596]
  * telemetry: Circonus integration for telemetry metrics [GH-1459]
  * telemetry: Allow operators to opt-in for publishing metrics [GH-1501]

BUG FIXES:
  * agent: Reload agent configuration on SIGHUP [GH-1566]
  * core: Sanitize empty slices/maps in jobs to avoid incorrect create/destroy
    updates [GH-1434]
  * core: Fix race in which a Node registers and doesn't receive system jobs
    [GH-1456]
  * core: Fix issue in which Nodes with large amount of reserved ports would
    casue dynamic port allocations to fail [GH-1526]
  * core: Fix a condition in which old batch allocations could get updated even
    after terminal. In a rare case this could cause a server panic [GH-1471]
  * core: Do not update the Job attached to Allocations that have been marked
    terminal [GH-1508]
  * agent: Fix advertise address when using IPv6 [GH-1465]
  * cli: Fix node-status when using IPv6 advertise address [GH-1465]
  * client: Merging telemetry configuration properly [GH-1670]
  * client: Task start errors adhere to restart policy mode [GH-1405]
  * client: Reregister with servers if node is unregistered [GH-1593]
  * client: Killing an allocation doesn't cause allocation stats to block
    [GH-1454]
  * driver/docker: Disable swap on docker driver [GH-1480]
  * driver/docker: Fix improper gating on priviledged mode [GH-1506]
  * driver/docker: Default network type is "nat" on Windows [GH-1521]
  * driver/docker: Cleanup created volume when destroying container [GH-1519]
  * driver/rkt: Set host environment variables [GH-1581]
  * driver/rkt: Validate the command and trust_prefix configs [GH-1493]
  * plan: Plan on system jobs discounts nodes that do not meet required
    constraints [GH-1568]

## 0.4.0 (June 28, 2016)

__BACKWARDS INCOMPATIBILITIES:__
  * api: Tasks are no longer allowed to have slashes in their name [GH-1210]
  * cli: Remove the eval-monitor command. Users should switch to `nomad
    eval-status -monitor`.
  * config: Consul configuration has been moved from client options map to
    consul block under client configuration
  * driver/docker: Enabled SSL by default for pulling images from docker
    registries. [GH-1336]

IMPROVEMENTS:
  * core: Scheduler reuses blocked evaluations to avoid unbounded creation of
    evaluations under high contention [GH-1199]
  * core: Scheduler stores placement failures in evaluations, no longer
    generating failed allocations for debug information [GH-1188]
  * api: Faster JSON response encoding [GH-1182]
  * api: Gzip compress HTTP API requests [GH-1203]
  * api: Plan api introduced for the Job endpoint [GH-1168]
  * api: Job endpoint can enforce Job Modify Index to ensure job is being
    modified from a known state [GH-1243]
  * api/client: Add resource usage APIs for retrieving tasks/allocations/host
    resource usage [GH-1189]
  * cli: Faster when displaying large amounts ouptuts [GH-1362]
  * cli: Deprecate `eval-monitor` and introduce `eval-status` [GH-1206]
  * cli: Unify the `fs` family of commands to be a single command [GH-1150]
  * cli: Introduce `nomad plan` to dry-run a job through the scheduler and
    determine its effects [GH-1181]
  * cli: node-status command displays host resource usage and allocation
    resources [GH-1261]
  * cli: Region flag and environment variable introduced to set region
    forwarding. Automatic region forwarding for run and plan [GH-1237]
  * client: If Consul is available, automatically bootstrap Nomad Client
    using the `_nomad` service in Consul. Nomad Servers now register
    themselves with Consul to make this possible. [GH-1201]
  * drivers: Qemu and Java can be run without an artifact being download. Useful
    if the artifact exists inside a chrooted directory [GH-1262]
  * driver/docker: Added a client options to set SELinux labels for container
    bind mounts. [GH-788]
  * driver/docker: Enabled SSL by default for pulling images from docker
    registries. [GH-1336]
  * server: If Consul is available, automatically bootstrap Nomad Servers
    using the `_nomad` service in Consul.  [GH-1276]

BUG FIXES:
  * core: Improve garbage collection of allocations and nodes [GH-1256]
  * core: Fix a potential deadlock if establishing leadership fails and is
    retried [GH-1231]
  * core: Do not restart successful batch jobs when the node is removed/drained
    [GH-1205]
  * core: Fix an issue in which the scheduler could be invoked with insufficient
    state [GH-1339]
  * core: Updated User, Meta or Resources in a task cause create/destroy updates
    [GH-1128, GH-1153]
  * core: Fix blocked evaluations being run without properly accounting for
    priority [GH-1183]
  * api: Tasks are no longer allowed to have slashes in their name [GH-1210]
  * client: Delete tmp files used to communicate with execcutor [GH-1241]
  * client: Prevent the client from restoring with incorrect task state [GH-1294]
  * discovery: Ensure service and check names are unique [GH-1143, GH-1144]
  * driver/docker: Ensure docker client doesn't time out after a minute.
    [GH-1184]
  * driver/java: Fix issue in which Java on darwin attempted to chroot [GH-1262]
  * driver/docker: Fix issue in which logs could be spliced [GH-1322]

## 0.3.2 (April 22, 2016)

IMPROVEMENTS:
  * core: Garbage collection partitioned to avoid system delays [GH-1012]
  * core: Allow count zero task groups to enable blue/green deploys [GH-931]
  * core: Validate driver configurations when submitting jobs [GH-1062, GH-1089]
  * core: Job Deregister forces an evaluation for the job even if it doesn't
    exist [GH-981]
  * core: Rename successfully finished allocations to "Complete" rather than
    "Dead" for clarity [GH-975]
  * cli: `alloc-status` explains restart decisions [GH-984]
  * cli: `node-drain -self` drains the local node [GH-1068]
  * cli: `node-status -self` queries the local node [GH-1004]
  * cli: Destructive commands now require confirmation [GH-983]
  * cli: `alloc-status` display is less verbose by default [GH-946]
  * cli: `server-members` displays the current leader in each region [GH-935]
  * cli: `run` has an `-output` flag to emit a JSON version of the job [GH-990]
  * cli: New `inspect` command to display a submitted job's specification
    [GH-952]
  * cli: `node-status` display is less verbose by default and shows a node's
    total resources [GH-946]
  * client: `artifact` source can be interpreted [GH-1070]
  * client: Add IP and Port environment variables [GH-1099]
  * client: Nomad fingerprinter to detect client's version [GH-965]
  * client: Tasks can interpret Meta set in the task group and job [GH-985]
  * client: All tasks in a task group are killed when a task fails [GH-962]
  * client: Pass environment variables from host to exec based tasks [GH-970]
  * client: Allow task's to be run as particular user [GH-950, GH-978]
  * client: `artifact` block now supports downloading paths relative to the
    task's directory [GH-944]
  * docker: Timeout communications with Docker Daemon to avoid deadlocks with
    misbehaving Docker Daemon [GH-1117]
  * discovery: Support script based health checks [GH-986]
  * discovery: Allowing registration of services which don't expose ports
    [GH-1092]
  * driver/docker: Support for `tty` and `interactive` options [GH-1059]
  * jobspec: Improved validation of services referencing port labels [GH-1097]
  * periodic: Periodic jobs are always evaluated in UTC timezone [GH-1074]

BUG FIXES:
  * core: Prevent garbage collection of running batch jobs [GH-989]
  * core: Trigger System scheduler when Node drain is disabled [GH-1106]
  * core: Fix issue where in-place updated allocation double counted resources
    [GH-957]
  * core: Fix drained, batched allocations from being migrated indefinitely
    [GH-1086]
  * client: Garbage collect Docker containers on exit [GH-1071]
  * client: Fix common exec failures on CentOS and Amazon Linux [GH-1009]
  * client: Fix S3 artifact downloading with IAM credentials [GH-1113]
  * client: Fix handling of environment variables containing multiple equal
    signs [GH-1115]

## 0.3.1 (March 16, 2016)

__BACKWARDS INCOMPATIBILITIES:__
  * Service names that dont conform to RFC-1123 and RFC-2782 will fail
    validation. To fix, change service name to conform to the RFCs before
    running the job [GH-915]
  * Jobs that downloaded artifacts will have to be updated to the new syntax and
    be resubmitted. The new syntax consolidates artifacts to the `task` rather
    than being duplicated inside each driver config [GH-921]

IMPROVEMENTS:
  * cli: Validate job file schemas [GH-900]
  * client: Add environment variables for task name, allocation ID/Name/Index
    [GH-869, GH-896]
  * client: Starting task is retried under the restart policy if the error is
    recoverable [GH-859]
  * client: Allow tasks to download artifacts, which can be archives, prior to
    starting [GH-921]
  * config: Validate Nomad configuration files [GH-910]
  * config: Client config allows reserving resources [GH-910]
  * driver/docker: Support for ECR [GH-858]
  * driver/docker: Periodic Fingerprinting [GH-893]
  * driver/docker: Preventing port reservation for log collection on Unix platforms [GH-897]
  * driver/rkt: Pass DNS information to rkt driver [GH-892]
  * jobspec: Require RFC-1123 and RFC-2782 valid service names [GH-915]

BUG FIXES:
  * core: No longer cancel evaluations that are delayed in the plan queue
    [GH-884]
  * api: Guard client/fs/ APIs from being accessed on a non-client node [GH-890]
  * client: Allow dashes in variable names during interprelation [GH-857]
  * client: Updating kill timeout adheres to operator specified maximum value [GH-878]
  * client: Fix a case in which clients would pull but not run allocations
    [GH-906]
  * consul: Remove concurrent map access [GH-874]
  * driver/exec: Stopping tasks with more than one pid in a cgroup [GH-855]
  * client/executor/linux: Add /run/resolvconf/ to chroot so DNS works [GH-905]

## 0.3.0 (February 25, 2016)

__BACKWARDS INCOMPATIBILITIES:__
  * Stdout and Stderr log files of tasks have moved from task/local to
    alloc/logs [GH-851]
  * Any users of the runtime environment variable `$NOMAD_PORT_` will need to
    update to the new `${NOMAD_ADDR_}` varriable [GH-704]
  * Service names that include periods will fail validation. To fix, remove any
    periods from the service name before running the job [GH-770]
  * Task resources are now validated and enforce minimum resources. If a job
    specifies resources below the minimum they will need to be updated [GH-739]
  * Node ID is no longer specifiable. For users who have set a custom Node
    ID, the node should be drained before Nomad is updated and the data_dir
    should be deleted before starting for the first time [GH-675]
  * Users of custom restart policies should update to the new syntax which adds
    a `mode` field. The `mode` can be either `fail` or `delay`. The default for
    `batch` and `service` jobs is `fail` and `delay` respectively [GH-594]
  * All jobs that interpret variables in constraints or driver configurations
    will need to be updated to the new syntax which wraps the interpreted
    variable in curly braces. (`$node.class` becomes `${node.class}`) [GH-760]

IMPROVEMENTS:
  * core: Populate job status [GH-663]
  * core: Cgroup fingerprinter [GH-712]
  * core: Node class constraint [GH-618]
  * core: User specifiable kill timeout [GH-624]
  * core: Job queueing via blocked evaluations  [GH-726]
  * core: Only reschedule failed batch allocations [GH-746]
  * core: Add available nodes by DC to AllocMetrics [GH-619]
  * core: Improve scheduler retry logic under contention [GH-787]
  * core: Computed node class and stack optimization [GH-691, GH-708]
  * core: Improved restart policy with more user configuration [GH-594]
  * core: Periodic specification for jobs [GH-540, GH-657, GH-659, GH-668]
  * core: Batch jobs are garbage collected from the Nomad Servers [GH-586]
  * core: Free half the CPUs on leader node for use in plan queue and evaluation
    broker [GH-812]
  * core: Seed random number generator used to randomize node traversal order
    during scheduling [GH-808]
  * core: Performance improvements [GH-823, GH-825, GH-827, GH-830, GH-832,
    GH-833, GH-834, GH-839]
  * core/api: System garbage collection endpoint [GH-828]
  * core/api: Allow users to set arbitrary headers via agent config [GH-699]
  * core/cli: Prefix based lookups of allocs/nodes/evals/jobs [GH-575]
  * core/cli: Print short identifiers and UX cleanup [GH-675, GH-693, GH-692]
  * core/client: Client pulls minimum set of required allocations [GH-731]
  * cli: Output of agent-info is sorted [GH-617]
  * cli: Eval monitor detects zero wait condition [GH-776]
  * cli: Ability to navigate allocation directories [GH-709, GH-798]
  * client: Batch allocation updates to the server [GH-835]
  * client: Log rotation for all drivers [GH-685, GH-763, GH-819]
  * client: Only download artifacts from http, https, and S3 [GH-841]
  * client: Create a tmp/ directory inside each task directory [GH-757]
  * client: Store when an allocation was received by the client [GH-821]
  * client: Heartbeating and saving state resilient under high load [GH-811]
  * client: Handle updates to tasks Restart Policy and KillTimeout [GH-751]
  * client: Killing a driver handle is retried with an exponential backoff
    [GH-809]
  * client: Send Node to server when periodic fingerprinters change Node
    attributes/metadata [GH-749]
  * client/api: File-system access to allocation directories [GH-669]
  * drivers: Validate the "command" field contains a single value [GH-842]
  * drivers: Interpret Nomad variables in environment variables/args [GH-653]
  * driver/rkt: Add support for CPU/Memory isolation [GH-610]
  * driver/rkt: Add support for mounting alloc/task directory [GH-645]
  * driver/docker: Support for .dockercfg based auth for private registries
    [GH-773]

BUG FIXES:
  * core: Node drain could only be partially applied [GH-750]
  * core: Fix panic when eval Ack occurs at delivery limit [GH-790]
  * cli: Handle parsing of un-named ports [GH-604]
  * cli: Enforce absolute paths for data directories [GH-622]
  * client: Cleanup of the allocation directory [GH-755]
  * client: Improved stability under high contention [GH-789]
  * client: Handle non-200 codes when parsing AWS metadata [GH-614]
  * client: Unmounted of shared alloc dir when client is rebooted [GH-755]
  * client/consul: Service name changes handled properly [GH-766]
  * driver/rkt: handle broader format of rkt version outputs [GH-745]
  * driver/qemu: failed to load image and kvm accelerator fixes [GH-656]

## 0.2.3 (December 17, 2015)

BUG FIXES:
  * core: Task States not being properly updated [GH-600]
  * client: Fixes for user lookup to support CoreOS [GH-591]
  * discovery: Using a random prefix for nomad managed services [GH-579]
  * discovery: De-Registering Tasks while Nomad sleeps before failed tasks are
    restarted.
  * discovery: Fixes for service registration when multiple allocations are bin
    packed on a node [GH-583]
  * configuration: Sort configuration files [GH-588]
  * cli: RetryInterval was not being applied properly [GH-601]

## 0.2.2 (December 11, 2015)

IMPROVEMENTS:
  * core: Enable `raw_exec` driver in dev mode [GH-558]
  * cli: Server join/retry-join command line and config options [GH-527]
  * cli: Nomad reports which config files are loaded at start time, or if none
    are loaded [GH-536], [GH-553]

BUG FIXES:
  * core: Send syslog to `LOCAL0` by default as previously documented [GH-547]
  * client: remove all calls to default logger [GH-570]
  * consul: Nomad is less noisy when Consul is not running [GH-567]
  * consul: Nomad only deregisters services that it created [GH-568]
  * driver/exec: Shutdown a task now sends the interrupt signal first to the
    process before forcefully killing it. [GH-543]
  * driver/docker: Docker driver no longer leaks unix domain socket connections
    [GH-556]
  * fingerprint/network: Now correctly detects interfaces on Windows [GH-382]

## 0.2.1 (November 28, 2015)

IMPROVEMENTS:

  * core: Can specify a whitelist for activating drivers [GH-467]
  * core: Can specify a whitelist for activating fingerprinters [GH-488]
  * core/api: Can list all known regions in the cluster [GH-495]
  * client/spawn: spawn package tests made portable (work on Windows) [GH-442]
  * client/executor: executor package tests made portable (work on Windows) [GH-497]
  * client/driver: driver package tests made portable (work on windows) [GH-502]
  * client/discovery: Added more consul client api configuration options [GH-503]
  * driver/docker: Added TLS client options to the config file [GH-480]
  * jobspec: More flexibility in naming Services [GH-509]

BUG FIXES:

  * core: Shared reference to DynamicPorts caused port conflicts when scheduling
    count > 1 [GH-494]
  * client/restart policy: Not restarting Batch Jobs if the exit code is 0 [GH-491]
  * client/service discovery: Make Service IDs unique [GH-479]
  * client/service: Fixes update to check definitions and services which are already registered [GH-498]
  * driver/docker: Expose the container port instead of the host port [GH-466]
  * driver/docker: Support `port_map` for static ports [GH-476]
  * driver/docker: Pass 0.2.0-style port environment variables to the docker container [GH-476]
  * jobspec: distinct_hosts constraint can be specified as a boolean (previously panicked) [GH-501]

## 0.2.0 (November 18, 2015)

__BACKWARDS INCOMPATIBILITIES:__

  * core: HTTP API `/v1/node/<id>/allocations` returns full Allocation and not
    stub [GH-402]
  * core: Removed weight and hard/soft fields in constraints [GH-351]
  * drivers: Qemu and Java driver configurations have been updated to both use
    `artifact_source` as the source for external images/jars to be ran
  * jobspec: New reserved and dynamic port specification [GH-415]
  * jobspec/drivers: Driver configuration supports arbitrary struct to be
    passed in jobspec [GH-415]

FEATURES:

  * core: Blocking queries supported in API [GH-366]
  * core: System Scheduler that runs tasks on every node [GH-287]
  * core: Regexp, version and lexical ordering constraints [GH-271]
  * core: distinctHost constraint ensures Task Groups are running on distinct
    clients [GH-321]
  * core: Service block definition with Consul registration [GH-463, GH-460,
    GH-458, GH-455, GH-446, GH-425]
  * client: GCE Fingerprinting [GH-215]
  * client: Restart policy for task groups enforced by the client [GH-369,
    GH-393]
  * driver/rawexec: Raw Fork/Exec Driver [GH-237]
  * driver/rkt: Experimental Rkt Driver [GH-165, GH-247]
  * drivers: Add support for downloading external artifacts to execute for
    Exec, Raw exec drivers [GH-381]

IMPROVEMENTS:

  * core: Configurable Node GC threshold [GH-362]
  * core: Overlap plan verification and plan application for increased
    throughput [GH-272]
  * cli: Output of `alloc-status` also displays task state [GH-424]
  * cli: Output of `server-members` is sorted [GH-323]
  * cli: Show node attributes in `node-status` [GH-313]
  * client/fingerprint: Network fingerprinter detects interface suitable for
    use, rather than defaulting to eth0 [GH-334, GH-356]
  * client: Client Restore State properly reattaches to tasks and recreates
    them as needed [GH-364, GH-380, GH-388, GH-392, GH-394, GH-397, GH-408]
  * client: Periodic Fingerprinting [GH-391]
  * client: Precise snapshotting of TaskRunner and AllocRunner [GH-403, GH-411]
  * client: Task State is tracked by client [GH-416]
  * client: Test Skip Detection [GH-221]
  * driver/docker: Can now specify auth for docker pull [GH-390]
  * driver/docker: Can now specify DNS and DNSSearch options [GH-390]
  * driver/docker: Can now specify the container's hostname [GH-426]
  * driver/docker: Containers now have names based on the task name. [GH-389]
  * driver/docker: Mount task local and alloc directory to docker containers [GH-290]
  * driver/docker: Now accepts any value for `network_mode` to support userspace networking plugins in docker 1.9
  * driver/java: Pass JVM options in java driver [GH-293, GH-297]
  * drivers: Use BlkioWeight rather than BlkioThrottleReadIopsDevice [GH-222]
  * jobspec and drivers: Driver configuration supports arbitrary struct to be passed in jobspec [GH-415]

BUG FIXES:

  * core: Nomad Client/Server RPC codec encodes strings properly [GH-420]
  * core: Reset Nack timer in response to scheduler operations [GH-325]
  * core: Scheduler checks for updates to environment variables [GH-327]
  * cli: Fix crash when -config was given a directory or empty path [GH-119]
  * client/fingerprint: Use correct local interface on OS X [GH-361, GH-365]
  * client: Nomad Client doesn't restart failed containers [GH-198]
  * client: Reap spawn-daemon process, avoiding a zombie process [GH-240]
  * client: Resource exhausted errors because of link-speed zero [GH-146,
    GH-205]
  * client: Restarting Nomad Client leads to orphaned containers [GH-159]
  * driver/docker: Apply SELinux label for mounting directories in docker
    [GH-377]
  * driver/docker: Docker driver exposes ports when creating container [GH-212,
    GH-412]
  * driver/docker: Docker driver uses docker environment variables correctly
    [GH-407]
  * driver/qemu: Qemu fingerprint and tests work on both windows/linux [GH-352]

## 0.1.2 (October 6, 2015)

IMPROVEMENTS:

  * client: Nomad client cleans allocations on exit when in dev mode [GH-214]
  * drivers: Use go-getter for artifact retrieval, add artifact support to
    Exec, Raw Exec drivers [GH-288]

## 0.1.1 (October 5, 2015)

IMPROVEMENTS:

  * cli: Nomad Client configurable from command-line [GH-191]
  * client/fingerprint: Native IP detection and user specifiable network
    interface for fingerprinting [GH-189]
  * driver/docker: Docker networking mode is configurable [GH-184]
  * drivers: Set task environment variables [GH-206]

BUG FIXES:

  * client/fingerprint: Network fingerprinting failed if default network
    interface did not exist [GH-189]
  * client: Fixed issue where network resources throughput would be set to 0
    MBits if the link speed could not be determined [GH-205]
  * client: Improved detection of Nomad binary [GH-181]
  * driver/docker: Docker dynamic port mapping were not being set properly
    [GH-199]

## 0.1.0 (September 28, 2015)

  * Initial release