Prevent right most popular from overlapping footer

This fixes some clearing issues with the article right hand column and more importantly prevent the new right most popular component from overlapping the footer.

/cc @kaelig 

#### Before
![screenshot from 2014-01-14 12 43 36](https://f.cloud.github.com/assets/80089/1910545/c6d39c3e-7d19-11e3-83a8-cd27ed663bd5.png)

#### After
![screenshot from 2014-01-14 12 43 20](https://f.cloud.github.com/assets/80089/1910546/caf1d59c-7d19-11e3-890b-099365a16441.png)