Some cleanup & refactors to Recent sorting UI

* Using native tabs seen elsewhere in the app, and deleting most of the styles I previously wrote.
* Some basic code refactors.

![screen shot 2014-12-12 at 8 48 17 pm](https://cloud.githubusercontent.com/assets/786691/5422623/e55cb1ea-8240-11e4-8633-9c12060e3887.png)