Handle album and artist view intents

Starting playback of an album (or all songs by artist) is very useful.
My current use case is a music library smartwatch app,
like Peapod for Pebble 1.0 and iOS.

Relevant SO question: http://stackoverflow.com/q/15571153/239140

Change-Id: Id6026176436be3d207c7fbf150044adfc14258e2