Ensure the menu works in the local Jekyll executions

The latest changes had lots of broken links, preventing me from
looking the web site on my local browser.
Add a news item about the repository renaming
Merge pull request #18 from piojo/announce-renames

Announce the renaming of the repositories of config modules.
new post saying that we've upgraded the sourceforge project

The sourceforge site has been updated. This is a summary of the
changes, especially how the new GIT URL's look.
Merge pull request #19 from njwilliams/njw/sourceforge-post

new post saying that we've upgraded the sourceforge project
Add the release notes for 13.3.
Complete the release notes.
Merge pull request #20 from piojo/quattor-13.3

Quattor 13.3; release notes look good to me.
Merge branch 'master' of git://github.com/quattor/quattor.github.com

Conflicts:
	_includes/menu.html