Fix NPE

Prevent ImageFetcher to return a Bitmap with null Config.

Change-Id: I8c9ace7ffa6f851524ce5c7b098ecf2c6768ac52
Invert Play/Pause buttons in Notification widget

The logical behaviour of the "Play" button is to actually play a song
when pressed. The current behaviour is to pause the song and the "Pause"
button resumes the playback.

Change-Id: Ib432bfe6c214e38196a25b00fbbc8fbfbc031ca7