rlworkgroup / garage / 4115

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master: 64%

Pull #486

travis-ci-com

Fix garage.spaces and enviroment wrapper bugs

* Fixes bug in garage/sampler/utils.py, where the sampler calls the
  flatten() helper (used for gym.spaces) rather than
  GarageEnv.flatten(). This is incorrect because the sampler assumes it
  is operating on a GarageEnv
* Changes GarageEnv to no longer be an ABC -- there are algorithms
  which depend only on numpy (not a NN library like TF or PyTorch), and
  those algorithms can use GarageEnv directly. No need for subclassing.
* Updates non-TF algorithm tests to use GarageEnv

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