This is to help make local dev [match what GitHub Pages is doing](https://help.github.com/articles/using-jekyll-with-pages). As long as you have Ruby 1.9.3 or 2.0.0 and bundler (`gem install bundler` to install), then the usual 
`bundle install` 
from the home directory will install GitHub's flavor of Jekyll.  Then
`bundle exec jekyll serve`
will start your local server and you can get to the homepage at
[http://localhost:4000/crc_website/](http://localhost:4000/crc_website/).