Another attempt at improving the colors.

- medium gray tabs background (taken from the ss rotterdam logo)
- yellow tab highlight
- light gray popup menu background (matches @color/gray_light)

![screenshot_2014-04-27-11-24-32](https://cloud.githubusercontent.com/assets/1841551/2810849/dc0a3336-cded-11e3-9acb-0c853f663cf1.png)