Fix splash layouts, other ui fixes

@hennevogel @differentreality please review.
This fixes #300 #323 #410 
![screenshot from 2014-08-01 12 40 34](https://cloud.githubusercontent.com/assets/3149236/3775816/fc951c30-194a-11e4-8e46-3a581a8f4d48.png)

Why don't you just use .text-center from bootstrap?