Removed the line around the "x" and settings gear

- Remove line around the "x"
- Decrease the padding at the top of the overlay
- Remove line around the settings gear

reviewer: @kvlees
![screen shot 2014-05-12 at 5 55 11 pm](https://cloud.githubusercontent.com/assets/4962198/2952380/d9ae1bcc-da39-11e3-9c87-4d4f83f4d337.png)
![screen shot 2014-05-12 at 5 55 19 pm](https://cloud.githubusercontent.com/assets/4962198/2952381/dd1402f4-da39-11e3-9fd2-28371dec326a.png)