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/enjoy_pybullet_racecar.py

@@ -1,5 +1,5 @@
 import gym
-from envs.bullet.racecarGymEnv import RacecarGymEnv
+from pybullet_envs.bullet.racecarGymEnv import RacecarGymEnv
 
 from baselines import deepq