SEO: keyword & contributor tag index pages

Looks terrible obviously and I need someone to style this appropriately, but wanted to get :+1: for the server side components.

![screen shot 2014-07-24 at 14 22 26](https://cloud.githubusercontent.com/assets/1001642/3688384/acaab43e-1335-11e4-82ab-af4a132ab5d3.png)

An A-Z listing of contributor and keyword tags for SEO purposes.