(WIP) porting frontend code to Bootstrap 3

Now with added unintentional iOS 7 feeling:

![screen shot 2013-10-04 at 07 05 26](https://f.cloud.github.com/assets/628602/1267293/a8fdd484-2cb2-11e3-8fc7-26faf8d607ee.png)

(work in progress, do not merge)