Jekyll plugin to propagate the site.github namespace

 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