Remove line clamping on lists with images

Fixes a nasty bug in Safari.

## Before (Safari)

![screen shot 2014-03-06 at 12 38 26](https://f.cloud.github.com/assets/85783/2345017/7006d7ae-a52d-11e3-902d-291fc886700a.PNG)


## After (Safari)

![screen shot 2014-03-06 at 12 38 08](https://f.cloud.github.com/assets/85783/2345018/72e683fc-a52d-11e3-8a61-3ddb5fae3a0c.PNG)


![ ](http://media.giphy.com/media/HPQnQK1dr5LgY/giphy.gif)