Library & Player updated

-Validate checksum and only accept unique songs to library
-Store image from ID3 tag
-Player uses JSON for communication with server
-Display details for the song currently playing
-Automatically change to next song in queue
-Automatically generate random queue
Merge branch 'master' of github.com:kwistbac/mJuke

Conflicts:
	mJuke/apps/establishment/urls.py
	mJuke/settings.py
	static/js/panel.js
	templates/establishment/base.html
Clean up merge