Edx-rbac

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* Fix bug in implicit role check when the same role has multiple contexts available.

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* Update `PermissionRequiredMixin` to pass through an object to rule predicates, if `self.get_permision_required` exists and is callable

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* Updated requirements.

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* Updated utils for user with multiple contexts.

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* Use functools.wraps to prevent the decorator from swallowing the view name

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* store current request on thread local storage using crum.