imathis/octopress — pull request #709 by Eric-Guo (2012-08-11 16:22:52+00:00)
Title: New feature, show a Category List in index page side bar area

Also fix the issue that access the [root of categories](http://octopress.org/blog/categories/) will lead a 404 page error.

Inspire by https://github.com/alswl/octopress-category-list