Supports for Madras Env

[buridiaditya]

This PR adds support for madras Env in baselines.

Testing:

1. clone the baselines and gym.
2. install editable copies of both using pip install -e .
3. run python -m baselines.run --alg=ddpg --env='gym-madras-v0' from baselines folder.

[rudrasohan]

@buridiaditya I am guessing when you were testing earlier the error was occurring due to some import problem.
Try adding import MADRaS in run.py. This worked for me.

[rudrasohan]

Update this one with the new env name & import MADRaS at the top.

[buridiaditya]

#3