Bug #693: Music content item is not played

Code Review: http://mrccodereview.cloudapp.net/ui#review:id=1276

a) First, beta content never used audio files (I searched for OGG/MP3/WAV under http://beta.chronozoom.com/chronozoom.svc/get?).
b) Audio files render incorrectly, this is being tested too close to shipping.
c) Some browsers support OGG some others support MP3; therefore, some exhibits will look broken for some users/browsers.