Zach homepage design updates!

Switched over to wells (from alert boxes)
Went to span4's because we removed the first box
Added a different picture
Switched a bunch of text around (text in picture wasn't final)

![screen shot 2013-10-14 at 4 30 27 pm](https://f.cloud.github.com/assets/689411/1330289/ac7e877e-3528-11e3-9fcb-65551f975fa7.png)