This is mostly a direct application of the ember-angle-brackets-codemod.
I manually restored newlines in multi-line component invocations, usually
preserving file line length except for now-non-positional link-to @route.
I needed to rename task to taskState in some cases to avoid Ember
Concurrency naming conflicts.
1. Extra whitespace
2. Remove redundant code
3. Remove redundant markup from test
4. placement-failure should be used as an inline component
5. Prefer `assign` polyfill
6. Use new `@ember' org style imports
Buck Doyle