Added the sha1 column to the database.
Modified tree-urls-queries to use SHA1 instead of UUIDs.
Fixed the tree-urls table conversion.
Finished porting tree-urls to using sha1 sums.
Got tree-url migrations working.
CORE-5451 Fixed /secured/rate-analysis endpoint.

The Donkey endpoint was accidentally passing the comment ID as the user rating score.
CORE-5457 CORE-5451 Updated rate-analysis endpoint.

Updated the RatingService#rateAnalysis method to allow the rating comment ID to be updated for existing ratings.
Rating values will also now be validated to allow only values from 1 - 5.
Cleaned up output for the migration commands.
Merge branch 'dev' of github.com:iPlantCollaborativeOpenSource/DiscoveryEnvironmentBackend into dev
Modified deletes for saved-searches to return consistently.
Modified the session deletion to return consistent values.
Modified user-preferences to return consistent values for deletions.
Added a handler for / to user-preferences.
Added a handler for / to user-sessions.
Added a handler for / to saved-searches.
Fixed the manifest so it includes a properly formatted URL listing.
Updated the docs on the manifest endpoint for the URLs.
Added riak-migrator to the build and uncommented the new services.
added a top level --version and --help for riak-migrator.
Added a client for the new user-preferences service.