initial models for music uploading
added rest of formats; added django-rest-framework
added basic discogs api class
cleaned up get_releases to use one request instead of 2 thanks to coaxmetal
cleaning up some more
initial discogs internal api
Merge branch 'feature/discogs-api' into develop

Conflicts:
	batter/batter/settings/base.py
	batter/music/models.py
	requirements/base.txt