Homepage restyle

Consider this a rough draft, and possibly an indicator of things to come for the rest of the site. 

(we do not currently use app/assets/images/book-table.jpg anywhere, but, it can be a drop-in replacement for the current landing page image)

Preview attached, in case you can't actually picture it by reading the CSS. Pfft. 
![capture](https://f.cloud.github.com/assets/681523/1129363/7f602986-1b89-11e3-9879-2d87a3c76ff3.PNG)