add hokuyu laser to quadrotor

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There is an example available within hector_quadrotor: https://github.com/tu-darmstadt-ros-p...

This model is using xacro scriptping to re-use different URDF model parts and adds the Gazebo plugin so the LIDAR is also available in simulation. Specifically, it uses a macro from the hokuyo_utm30lx.urdf.xacro file to add a Hokuyo LIDAR. This is different from the Turtlebot tutorial you linked, which only deals with updating the model without consideration of simulation.