For sites, specify the each_serializer for the photos
Return an array if there aren't any
Debugging on heroku becuase my fellow watersheds refuse to set up local environments
Return a session serializer and create error serailizers
Use error serializers for the user response
Merge pull request #283 from calblueprint/mark/api/error-serializer

Error Serializer and users returns a session now
Sign in the user, generate token, send session response
Merge pull request #290 from calblueprint/mark/api/new-users-nil-token

Sign in the user, generate token, send session response
Merge branch 'master' into melissa/ui

* master:
  Sign in the user, generate token, send session response
  Use error serializers for the user response
  Return a session serializer and create error serailizers
  Debugging on heroku becuase my fellow watersheds refuse to set up local environments
  Return an array if there aren't any
  For sites, specify the each_serializer for the photos