Homepage formatting

Fixed margins, added content and icons.

The breakpoints are messed up and need some love.

Also, the footer is set elsewhere - (in python lib?) - @miketaylr can you help me format that to look like this:
![screen shot 2014-04-16 at 10 07 17 pm](https://cloud.githubusercontent.com/assets/1103366/2728288/3009d282-c5ee-11e3-9270-0aa1c409c578.png)