use args instead of reproducing launcher content.
multihub rocon launcher for testing/tutorial.
catkin update for sources.
utilising the new conductor launcher and renaming included launchers.
removed non shared includes.
turtle_concert upgraded for multihub improvements.
hub and command line tutorials updated.
multihub updates for tutorials, adding rocon launchers as well.
rocon_orchestra -> concert_orchestra
finalising tutorials, one bug left.
Merge pull request #3 from robotics-in-concert/multi-hub

Multi hub