Added implementation of cmd_vel_mux to allow arbitration. To use run scitos_teleop_mux.launch and have the navigation publish to /cmd_vel_mux/input/navigation instead of /cmd_vel.
Joystick will now get priority over navigation if dead-man-switch is pressed.
Added README file with basic instructions.
Updated package.xml to make rosdep work.
Update teleop_joystick_mux.launch

Remove call to cmd_vel_mux to keep it more general usable.
Merge branch 'master' of https://github.com/cdondrup/scitos_apps
Merge branch 'master' of https://github.com/strands-project/scitos_apps
Merge branch 'master' of https://github.com/strands-project/scitos_apps
Merge pull request #9 from cdondrup/master

Works fine on Linda and does not change the default behaviour.