Container MPU max-height

Stops it increasing to an insane height if the neighbouring `linkslist` gets too high

### Desktop

![screen shot 2014-05-09 at 14 13 33](https://cloud.githubusercontent.com/assets/74132/2928369/f3764b94-d77b-11e3-8601-8ed2e39ab4c3.png)

### Tablet

![screen shot 2014-05-09 at 14 13 41](https://cloud.githubusercontent.com/assets/74132/2928371/f672b1b6-d77b-11e3-991c-3dd3a660548e.png)