new navigation bar frontend (bug 957299)

![screen shot 2014-02-28 at 2 32 39 pm](https://f.cloud.github.com/assets/674727/2299184/cb8a2a68-a0c8-11e3-9cf2-7f95346611ac.png)

http://people.mozilla.org/~mhanratty/feed_prototype_11082013/