Add another major version number pattern in find_program (fix to https://github.com/ros/catkin/issues/461)

I'm not sure if this is the best patch for the targetted issue, since I'm not an expert with `cmake`. But this seems to find `nosetests-2.7` on my `QNX`.
Merge pull request #462 from start-jsk/groovy-devel

Add another major version number pattern in find_program (fix to https://github.com/ros/catkin/issues/461)