Update Data-API Nav

Lots of changes in here, end result: navigation in the Data-API is simpler, makes more sense, and the page itself is **MUCH** shorter.

Each high-level object (ie Projects, Medias) now has an item in the nav, and the "intro" for each section contains the methods for that Object.

![screenshot 2013-11-08 12 06 55](https://f.cloud.github.com/assets/651753/1502268/4c8b2858-4898-11e3-886e-fc4aa453c0d2.png)

The previous problem was a nav that had way too much in it, it seemed redundant, and it didn't scroll with the visitor. Fix0red.