How do you install pybulletgym?

I installed openai gym, and pybulletgym. But how do I add the environments you have there?

I have attempted pip install pybulletgym, and get nothing

Feature Request

It would be nice to have an example showing how to load a robot from URDF / ROS (robot in meters) and then scale it (for millimeters).

robot = client.load_robot(load_geometry=True)
robot.artist = RobotArtist(robot.model)
robot.scale(1000)

It should also be ensured that scale() can be called before or after setting the artist, and lead to the same result.