Merge pull request #2 from davetcoleman/add-joystick-interface

Better user output, kinematic solver error handling, disclaimer
make the speed slower for the interactive marker to move from joystick
swap the functionality of changing eefs with changing planning groups
in joy stick interface
Merge branch 'add-joystick-interface' of github.com:garaemon/moveit_ros into add-joystick-interface

Conflicts:
	visualization/python/moveit_ros_visualization/moveit_joy.py
update joystick documentation according to the latest implementation