remove ellipis overflow in the nav

![screen shot 2014-10-27 at 12 00 13](https://cloud.githubusercontent.com/assets/867233/4790392/aeef4eea-5dd0-11e4-9e24-901d24b0d935.png)
becomes
![screen shot 2014-10-27 at 12 00 07](https://cloud.githubusercontent.com/assets/867233/4790387/a56e3b88-5dd0-11e4-9124-052b81c07ed5.png)

only seems to have affected firefox

fixes #6756