Catkin fuerte integration tests repaired

This is a backport of the integration tests that I restructured for groovy to fuerte. After the pull requests, nosetests should run through without fail, testing catkin_fuerte against core fuerte branches of ROS. This allows safer backporting of other features to fuerte (mainly catkin_init_workspace next).
I renamed some files from 'unstable' to 'test', so some backports will not be possible by mere cherry-picking, but hopefully the different names prevent confusion.