refactor pybullet/gym to allow instantiating environments directly from a pybullet install:

work-in-progress (need to add missing data files, fix paths etc)

example:

pip install pybullet
pip install gym

python
import gym
import pybullet
import pybullet_envs
env = gym.make("HumanoidBulletEnv-v0")

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

@@ -0,0 +1,7 @@
+from pybullet_envs.bullet.cartpole_bullet import CartPoleBulletEnv
+from pybullet_envs.bullet.minitaur_bullet import MinitaurBulletEnv
+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