Sharing buttons are aligned with top of article on tablet/desktop

## Before

![screen shot 2013-11-27 at 15 24 53](https://f.cloud.github.com/assets/85783/1632456/45fb9222-5778-11e3-9090-a980428fb676.png)


## After

![screen shot 2013-11-27 at 15 25 07](https://f.cloud.github.com/assets/85783/1632458/485c44e4-5778-11e3-87f6-4dfa7ddafa9f.png)

![ ](http://media2.giphy.com/media/wXhK6Bjw5fZZK/200.gif)