Add body to audio pages

![screen shot 2014-07-29 at 11 19 28](https://cloud.githubusercontent.com/assets/74132/3733638/5ad540b0-170a-11e4-9571-af50d3c550d7.png)

- ads / adcountdown don't need to be initialised on audio either
- omniture/ophan tracking are both video specific so I'm not sure about initialising them for audio