Added infrastructure to play sound effect

Signed-off-by: Hin Lam <max21226@Hin-Lams-iMac.local>
Added infrastructure in coin handler to different sound file by track

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

Conflicts:
	sources/Coin.m

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