message: Update demo_husky.launch
diff: $ roslaunch husky_gazebo husky_playpen.launch realsense_enabled:=true
  $ roslaunch husky_viz view_robot.launch
  + For ICP odometry examples, rtabmap should be built with libpointmatcher.
  +
  Examples:
  1) 6DoF mapping with 3D LiDAR
  $ roslaunch rtabmap_ros demo_husky.launch lidar3d:=true slam2d:=false
  