Jekyll plugin to propagate the site.github namespace and set default values for use with GitHub Pages.

* Propagates the site.github namespace with repository metadata * Sets site.title as the repository name, if none is set * Sets site.description as the repository tagline if none is set * Sets site.url as the GitHub Pages domain (cname or user domain), if none is set * Sets site.baseurl as the project name for project pages if none is set