UrdfImporter: Collada DAE, rudimentary support for polylist (for ANYmal), assumes all polygons have 3 vertices

remove obsolete env from __init__.py

examples/pybullet/gym/pybullet_envs/bullet/__init__.py

@@ -3,6 +3,5 @@ from pybullet_envs.bullet.minitaur_gym_env import MinitaurBulletEnv
 from pybullet_envs.bullet.minitaur_duck_gym_env import MinitaurBulletDuckEnv
 from pybullet_envs.bullet.racecarGymEnv import RacecarGymEnv
 from pybullet_envs.bullet.racecarZEDGymEnv import RacecarZEDGymEnv
-from pybullet_envs.bullet.simpleHumanoidGymEnv import SimpleHumanoidGymEnv
 from pybullet_envs.bullet.kukaGymEnv import KukaGymEnv
 from pybullet_envs.bullet.kukaCamGymEnv import KukaCamGymEnv