Add the puppetlabs modules apache (1.0.1) and concat (1.0.2)
Move GCWeb to /projects and serve it from the synced folder

* Add GCWeb as a git submodule
* Don't download phpBB anymore, but serve GCWeb after adding
  the config files directly from ./projects/GCWeb (host) /
  /vagrant/projects/GCWeb (VM).
  The initial Data we import doesn't reference the prosilver style
  anymore so GCWeb works without additions.
* Hack Vagrantfile to change the permissions of several directories
  inside GCWeb/forum so uploads/config changes in phpBB can be written.
* Configure Apache install mod-php together with some other mods
  and serve the GCWeb dir.
* Dokumentation