Buttons with only an icon

## Before

![capture d ecran 2014-11-14 a 15 43 16](https://cloud.githubusercontent.com/assets/116530/5047379/254ed59a-6c15-11e4-8813-cc32bff763e8.png)

-------------------------------

## After

![capture d ecran 2014-11-14 a 15 44 12](https://cloud.githubusercontent.com/assets/116530/5047381/2682a752-6c15-11e4-9d66-fc3f69b2b2d4.png)