Navigation styles

* Adds new header elements
* Adds styles for header
* Adds two sets of icons to the header
![image](https://f.cloud.github.com/assets/1056838/982185/0a70e2ae-07d5-11e3-9ef3-9b83040b1842.png)
![image](https://f.cloud.github.com/assets/1056838/982186/21155652-07d5-11e3-95fd-63f04bb1b1e9.png)