[cpt_matching_algorithms] Investigate connection to rostest core.

[hermannsblum]

The test cases seem to work now, just make sure that there is a roscore running in another terminal if using "catkin run_tests --no-deps --this". Otherwise catkin build ends up in a loop.

This should not be necessary. However, I am also not that experienced with rostest. Theoretically, rostest should launch isolated roscores for each test and connect to those automatically (http://wiki.ros.org/rostest/Writing).

Originally posted by @hermannsblum in #77