rlworkgroup / garage / 2744

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master: 64%

Pull #318

travis-ci-com

Verify serializable parameters can be retrieved

For the serialization of objects in Garage, besides verifying no
exception is thrown by serializing them, it's necessary to verify that
their parameters can be fetched by un-serializing them.
Also, the script check_tests.sh was restored and a separate script to
test cron jobs was created instead.
The helper method pickle_env_with_gym_quirks was merged into
step_env_with_gym_quirks since they're almost doing the same thing, and
the parameter serialize_env is used now to pickle/unpickle the
environment.
Finally, the method close_viewer_window was moved into GarageEnv class,
so the viewer windows produced by MuJoCo get closed not only for tests.

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