Earn some space with stackable grid

When you are on a mobile, space is precious :)

Before:
![capture decran 2013-12-04 a 17 12 05](https://f.cloud.github.com/assets/359847/1674991/071eade8-5d02-11e3-897d-b87fe1f7f1c3.png)


After :
![capture decran 2013-12-04 a 17 27 27](https://f.cloud.github.com/assets/359847/1674969/9569d9f2-5d01-11e3-990e-09d025b2cd63.png)