Show a button to go back to files view

fixed #2961

![screen shot 2014-07-28 at 1 16 07 pm](https://cloud.githubusercontent.com/assets/332168/3726521/063f4080-1694-11e4-9a05-37b0aef0bb94.png)

review: @devoncarew

Show Files? Back to Files? Back to files view? Close Search?