simulation environment for arlo

[danial dunson]

Built the simulation environment from the turtlebot tutorials in ros-melodic.... inertial values taken from solidworks. 

https://github.com/danialdunson/arlo_gazebo

Hope this helps some people. There is some extraneous launch arguments to support a robotic arm.

[danial dunson]

cleaner version of package 

https://github.com/danialdunson/arlo_simulations