Updated pyrus bundle

Hi, I don't know if you are updating the Pyrus bundle anymore, but here's a version that works with Symfony 2.0.

Changes: 
 * I disabled the bundlesDir and bundles roles as could not get them to work.
 * I changed the namespace from Bundle\phpBB to phpBB
 * I updated the PyrusCommand to use the Container.
 * I added a readme file. 

Hope the changes are ok. Regards.