Compensate for image-width on media cards

This will make images clickable/tappable on `list-media` items.

cc @sndrs 

Before:
![screen shot 2014-10-15 at 14 55 36](https://cloud.githubusercontent.com/assets/1607666/4646407/f104ff58-5472-11e4-8e67-5ecadae1fc62.png)

After:
![screen shot 2014-10-15 at 14 55 48](https://cloud.githubusercontent.com/assets/1607666/4646406/efe27e70-5472-11e4-8bd6-6b185e21a68a.png)