Added code to mute or resume the game sound when background
Ipod music is running/stopped.

Signed-off-by: Hin Lam <max21226@Hin-Lams-iMac.local>
Merge remote-tracking branch 'max21226/GA_March2' into rotato_master

Conflicts:
	sources/GameInfoGlobal.h
	sources/GameInfoGlobal.m

Signed-off-by: Matt Cleveland <mgcleveland@gmail.com>