Switch up the fonts and navbar

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)