Moved sources to src branch; push static builds to master branch.

To allow for plugins, I switched to a method perscribed by
http://ixti.net/software/2013/01/28/using-jekyll-plugins-on-github-pages.html

The Rakefile commands generate and publish run Jekyll locally and
push the resulting static site to the master branch.  Future `real'
development will happen here in source.
Added disqus shortname; edited first post.

Nothing major.