Basic spotify playback

-spotify_proxy.py must be running
-Enter Spotify Premium username and password (under Other information)
-Still no UI for adding spotify songs => add in DB for testing
-DB fields:
	source (0 -> Local file, 1 -> Spotify track)
	hash (MD5 sum if local file, otherwise Spotify track ID)

-DB changes: votune_alter_db.sql
Merge branch 'master' of github.com:kwistbac/votune