* Added an gazebo server to lauch file and a world file
The Pionner3AT and Willow Garage office must be in the model path
and the gazebo setup.sh script mush be in the user's ~/.bashrc
Add launch files for gazebo server that spawns robot and office
Add launch file for rviz
Add mux for multiple control methods
Add rosaria launch file
Change names of demo launch files for clarity. 'demo_'
Moved most nodes/params/topics/services within /Pioneer3AT namespace
which should be easy to glob in the future for mult-robot systems