Adding options for commercial capi multi component

This allows merchandising to select "Brought to you by", "Sponsored by" & "Supported by" from an option in the DFP template. This then adds the correct styles and label to the component as required.

![screen shot 2014-11-25 at 15 41 32](https://cloud.githubusercontent.com/assets/1303616/5185772/b43bcce8-74b9-11e4-96c0-e18a6cfb8240.png)

cc @Calanthe 

Part of @ironsidevsquincy brave new world.
remove reference to `fc-container--merchandising-feature`; there's already a `fc-container--commercial-capi` class on the container