message: demo husky: added 3dlidar+slam2d examples
diff: 3) 6DoF mapping with 3D LiDAR and RGB-D camera and ICP odometry (with wheel odometry as guess)
  $ roslaunch rtabmap_ros demo_husky.launch lidar3d:=true slam2d:=false camera:=true icp_odometry:=true
  - 4) 3DoF mapping with 2D LiDAR
  + 4) 3DoF mapping with 3D LiDAR
  + $ roslaunch rtabmap_ros demo_husky.launch lidar3d:=true slam2d:=true
  +
  + 5) 3DoF mapping with 3D LiDAR and RGB-D camera
  + $ roslaunch rtabmap_ros demo_husky.launch lidar3d:=true slam2d:=true camera:=true
  +
  + 6) 3DoF mapping with 3D LiDAR and RGB-D camera and ICP odometry (with wheel odometry as guess)
  + $ roslaunch rtabmap_ros demo_husky.launch lidar3d:=true slam2d:=true camera:=true icp_odometry:=true
  +
  + 7) 3DoF mapping with 2D LiDAR
  $ roslaunch rtabmap_ros demo_husky.launch lidar2d:=true slam2d:=true
  - 5) 3DoF mapping with 2D LiDAR and RGB-D camera
  + 8) 3DoF mapping with 2D LiDAR and RGB-D camera
  $ roslaunch rtabmap_ros demo_husky.launch lidar2d:=true slam2d:=true camera:=true
  - 6) 6DoF mapping with 3D LiDAR and RGB-D camera and ICP odometry (with wheel odometry as guess)
  + 9) 3DoF mapping with 3D LiDAR and RGB-D camera and ICP odometry (with wheel odometry as guess)
  $ roslaunch rtabmap_ros demo_husky.launch lidar2d:=true slam2d:=true camera:=true icp_odometry:=true
  Issues:
  