Deobfuscation of the code base + pep8 and fixes

• Fixed tf.session().__enter__() being used, rather than sess = tf.session() and passing the session to the objects
• Fixed uneven scoping of TensorFlow Sessions throughout the code
• Fixed rolling vecwrapper to handle observations that are not only grayscale images
• Fixed deepq saving the environment when trying to save itself
• Fixed ValueError: Cannot take the length of Shape with unknown rank. in acktr, when running run_atari.py script.
• Fixed calling baselines sequentially no longer creates graph conflicts
• Fixed mean on empty array warning with deepq
• Fixed kfac eigen decomposition not cast to float64, when the parameter use_float64 is set to True
• Fixed Dataset data loader, not correctly resetting id position if shuffling is disabled
• Fixed EOFError when reading from connection in the worker in subproc_vec_env.py
• Fixed behavior_clone weight loading and saving for GAIL
• Avoid taking root square of negative number in trpo_mpi.py
• Removed some duplicated code (a2cpolicy, trpo_mpi)
• Removed unused, undocumented and crashing function reset_task in subproc_vec_env.py
• Reformated code to PEP8 style
• Documented all the codebase
• Added atari tests
• Added logger tests

Missing: tests for acktr continuous (+ HER, gail but they rely on mujoco...)