Merge pull request #29 from smarthi/master

Adding @Provider classes to be loaded into Application Context
Update formal note about contributing from Spark text
I forgot I don't like @author tags
Issue #30 : use Strings for IDs in ALS apps where possible
Add basic REST endpoint testing framework and get injection working with Grizzly
Switch to Jackson for JSON to get tests running
REST endpoint for /ready, added method Solver.solveFToD()
Minor fixes from the last PR feedback, added ExceptionMapper for exception handling, unit tests for REST endpoints
Merge branch 'master' of https://github.com/smarthi/oryx
minor tweaks
Added unit tests for few RESt endpoints, wired ExceptionMapper into /estimate, other code changes