Following Google Code closure, the original project has been archived by Google.
I decided to not move it to GitHub in order to be completely independent, and have more flexibility. After few weeks of testing different solution, I finally made something really simple. As WebIOPi downloads already provide complete source code, I also decided to stop providing a public code repository (svn/git). Files remains on sourceforge for the moment.
You can find the new WebIOPi website at http://webiopi.trouch.com