* accommodate salt lengths for RSA PSS
* address feedback
* generalise salt length to an int
* fix error reporting
* Revert "fix error reporting"
This reverts commit 8adfc15fe3303b8fdf9f094ea246945ab1364077.
* fix a faulty check
* check for min/max salt lengths
* stringly-typed HTTP param
* unit tests for sign/verify HTTP requests
also, add marshaling for both SDK and HTTP requests
* randomly sample valid salt length
* add changelog
* add documentation
Trishank Karthik Kuppusamy