Browse Artists and Albums
Browse Artists and Albums

Let user browse the existing/cached library.
No network IO calls done during browse.

Directory Structure:

* Google Music
  * Albums
    * Tracks
  * Artists
    * All Tracks
      * Tracks
    * Albums
      * Tracks

hechtus/mopidy-gmusic,elrosti/mopidy-gmusic,jodal/mopidy-gmusic,mopidy/mopidy-gmusic