Chord diagram

I propose to include an alternative view with a chord diagram. This is just a POC in a separate file, but I think it would be nice being able to switch between the two diagrams on the index page.

![Screen Shot 2013-04-06 at 13 06 50](https://f.cloud.github.com/assets/13346/347201/54bdf962-9eaa-11e2-96b0-81caaf1ce5bf.png)