Corrected mix up of mobile and PC implementation
Merge branch 'master' of github.com:KoodalLabs/music_cutter
corrected a syntax error in upload song controller
corrected logical error in related songs
Refactored user controller
Refactored favourite controller
Refactored upload song controller
Refactored upload song controller again
Refactored upload song controller - 3rd attempt
Refactored upload song controller - 4th attempt
Refactored upload song controller - 5th attempt
Refactored playlists controller
Refactored upload song controller - 6th attempt
Refactored passwords controller
Refactored upload song controller - 7th attempt
Refactored authentications controller
 Refactored Fat model UploadedSong. Moved all external service tasks to lib/ TODO: come up with really good lib names.