Turning on masterclasses V2 commercial component

cc @paulrobertlloyd 

This makes live the V2 version of the Masterclasses commercial component. (The code for this has already been committed and +1'd.)

Before & after in one handy screenshot, (from the commercial component test page http://m.code.dev-theguardian.com/commercial/test-page);

![screen shot 2014-10-15 at 12 06 35](https://cloud.githubusercontent.com/assets/1303616/4644466/83b81942-545b-11e4-8829-0f9a5308edc9.png)