Various UI changes

Changes include:

* Clientside "page" changes via new navigation bar.
* Centered, and reduced width columns.
* Use fancy serif font only for titles and important stuff, set body to sans. For contrast.

Screenshots of changes below.

![screen shot 2013-08-21 at 3 17 38 pm](https://f.cloud.github.com/assets/43438/999118/5514feb4-0a21-11e3-993c-eca74b4d5999.png)
![screen shot 2013-08-21 at 3 17 42 pm](https://f.cloud.github.com/assets/43438/999117/54d923f8-0a21-11e3-979c-aa9a5fb759da.png)