Add Spotify framework
Finish going through Spotify's tutorial; need to debug

There seems to be some loss when translating from Objective-C to Swift. This is an end of the night commit. I'll debug in the morning.
Fix issue where the SPTAuth object couldn't handle the callback URL

There was a problem with capitalization in the callback URL declared on the Spotify developer application portal.
The fix was to simply make all characters lowercase.
Fix callback URL on the ruby script by making all characters lowercase
Add more verbose NSLogs
Move Spotify authentication into initial view controller
Merge branch 'feature/SpotifyTutorial' into develop