Merge pull request #14 from chorus-frogs-2014/backend

Backend
Models: Tests for validations
Merge pull request #15 from chorus-frogs-2014/backend

Added ability to associate a user with a feed, delete a feed, and added ...
Cleaned up
Merge pull request #16 from chorus-frogs-2014/testangggg

OK.
improved filenames and added draft of feeds#index
Merge branch 'master' into backend
Added categories and descriptions to feeds