Merge pull request #11 from marc-hanheide/master

Initial version of a simple navigation widget to send the robot around in the 2D map
Removed unnecessary map file.
Cleaned up formatting errors for .rosinstall text.
added teleop control for PTU
Merge pull request #15 from kunzel/ptu

added teleop control for PTU
Added comments on how to deal with robot pose. Fixes #12.
Merge pull request #17 from hawesie/master

Added nodes on robot_pose for 2D nav view