Fixed Issue #504

Hi,

I managed to find a way to fix this issue my increase the size where the navbar starts to collapse. This is needed because we have to many items in our top-navigation bar ... . .
![bildschirmfoto 2014-03-03 um 19 01 56](https://f.cloud.github.com/assets/5738978/2312584/ff859d48-a2fd-11e3-9e57-76563a9b667c.png)


fixes #5