changed schedule_spin to create_spin
Added thorough tests for db insert_spin
Added move_spin and specs to db
Added add_spin and tests to db
Added remove_spin and tests
Added create_user use_case and spec
Added CreateUser and specs
GetUserByTwitter usecase added
Added GetTwitterByUID
Added DeleteUser usecase
Fixed some bugs, added create_station
Added UpdateStation UseCase
Added GetStation
Added vcr and webmock gems, set up 'process_song' usecase and tests with mocked AWS calls
Added get_song usecase
Added GetAllSongs UseCase and tests
Fixed GetAllSongs spec
Added GetSongsByTitle UseCase and tests
Added GetSongsByArtist UseCase
Added UpdateSong UseCase and specs