Commercial: fronts advertisement

Styling sponsored/advertisement feature badges on containers of fronts

### Container

![screen shot 2014-04-29 at 14 57 03](https://cloud.githubusercontent.com/assets/74132/2829677/365cb746-cfa6-11e3-84c0-7003c045e067.png)

### Front

![screen shot 2014-04-29 at 14 57 14](https://cloud.githubusercontent.com/assets/74132/2829679/3b075efe-cfa6-11e3-8439-f5184d1aef8e.png)