Fix horizontal spacing on featured items widget.

Fixes #530 

![with-sidebar](https://cloud.githubusercontent.com/assets/96776/2638392/49743d18-bead-11e3-8800-aa418285ac97.png)

![no-sidebar](https://cloud.githubusercontent.com/assets/96776/2638394/4d10fbfa-bead-11e3-8ed3-4cff51e996d8.png)