improve copy and layout on the home page

This improves the copy and layout of the home page
**Home page**

![screen shot 2013-11-13 at 2 14 57 pm](https://f.cloud.github.com/assets/331004/1534633/113ac854-4c98-11e3-9182-f4ad009f8bd0.png)

**Button**

![screen shot 2013-11-13 at 2 16 41 pm](https://f.cloud.github.com/assets/331004/1534645/44c1fabc-4c98-11e3-933f-f52f6c837de7.png)