WIP: Adding a blog

This is a major change.

This pull request changes the site to use [Jekyll](https://github.com/mojombo/jekyll), tool to create blogs using static files.

The blog content is accessible through a 'Program Updates' link in the header.

You can see this on the staging site: http://cutgroup-staging.smartchicagoapps.org/updates/index.html and a sample post: http://cutgroup-staging.smartchicagoapps.org/updates/hello-world.html

The content for that post is written in markdown: https://github.com/smartchicago/cutgroup/blob/jekyllification/src/_posts/2013-03-16-hello-world.md

Creating a new post is simple process: add a new file in the `_posts` directory, run the `jekyll` command, and deploy the `site/` directory (`make deploy`).

TODO:

- need real content for the first post