Added support for the com.android.music.metachanged

Added support for the com.android.music.metachanged to get music metadata to display correctly on A2DP/AVRCP devices. It seems that without the metachanged intent, the metadata like Feed Title and Episode Title will not be displayed. 
Disclaimer: I don't have Android SDK installed, so I haven't really tested this patch (not even compiled it), but I kept it small and "it should work" (tm).