Nicer looking main buttons.

![btn2](https://cloud.githubusercontent.com/assets/433231/2626236/1845f644-bdc4-11e3-9563-e2b4b798447c.png)
![btn1](https://cloud.githubusercontent.com/assets/433231/2626237/1847cd52-bdc4-11e3-84dc-eeb14577445f.png)