Top navigation issues

- On small screens, the gap between search and log out is noticeably larger than the gap between home and notifications
- The order of the search and log out buttons is still reversed, causing tab order to be unnatural. We should revert to a structure where the logical order is preserved

![screen shot 2014-03-05 at 13 56 09](https://f.cloud.github.com/assets/109850/2333612/1f35ca48-a46e-11e3-8065-f112bc009cab.png)