Creating singleton audio manager
Merge branch 'audioPlayer' into feature-audio-manager
Fixing merge changes
Added sound calls to additional files to play when buttons are pressed.
Shortened the cell pressed and infection cleared sound effects.
Deleted non-shortened sound files.
Deleted unused file duplicates.
Added menu button sound effect to spam mini game's two main buttons. Also added infected cell pressed sound effect when you press an infected cell.
Added and implemented buttons to toggle the music and sound effects.
Changed singleton pattern to use dispatch_once.
Merge branch 'develop' into feature-audio-manager
Merge remote-tracking branch 'origin/feature-audio-manager' into feature-audio-manager
Merge pull request #45 from zsweedyk/feature-audio-manager

Feature audio manager