restructured sickrd task, it is easier to load different strategies.
added cameras to rviz config
Merge branch 'master' of git@github.com:GKIFreiburg/gki_sickrd2014.git

Conflicts:
	gki_sickrd_executive/rviz.rviz
	gki_sickrd_task/src/gki_sickrd_task/deliver_cubes_strategy.py
	gki_sickrd_task/src/gki_sickrd_task/random_move_strategy.py