Switch up the fonts

I've switched up the fonts in the 1.0.0 docs branch, using Lato as the primary font, and Droid Sans Mono as the code font. Here's a screenshot:

![screen shot 2014-04-18 at 5 03 55 pm](https://cloud.githubusercontent.com/assets/860934/2740053/8f8dde72-c6c7-11e3-8e8b-a05eb1682537.png)