Adding SEO tags, updating toc design

* Added a subtle border along the edge of the table of contents. 
* Added robots.txt to prevent duplicate indexing of freemarker docs and api
* Added canonical, prev, and next urls for better indexing
![screen shot 2014-10-26 at 2 10 28 pm](https://cloud.githubusercontent.com/assets/993432/4784430/53aa3c60-5d54-11e4-9e27-75c728779170.png)