Buttons can now start/stop/loop tracks correctly.
Merge branch 'dev' of github.com:wimbot32259/M3-BeatMatrix into dev

Conflicts:
	BeatMatrix/bin/ButtonMatrix.apk
	BeatMatrix/bin/classes.dex
	BeatMatrix/src/com/joshuac/beatmatrix/BeatButton.java
	BeatMatrix/src/com/joshuac/beatmatrix/MediaPlayerThread.java