drawing graphs

Stats graphs! :dancers: A simple visualization of what the stat API returns. 

![fandomstats-second](https://cloud.githubusercontent.com/assets/7269683/2850575/686fb3fc-d102-11e3-9c97-7eebf20ceb5c.gif)

Right now it just adds more graphs to the page when you request tags.

This is a test to give you both a better idea of how d3 works (and how the APIs get consumed client-side). We don't have to keep any of this code (we should think more about the FE than this :D), it's just demonstrative. I'll annotate inline.