Redis-throttled-queue

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* Fixed bogus error in ``cleanup()`` when db is completely empty.

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* Added ``last_activity`` and ``idle_seconds`` attributes.
* Added a ``cleanup()`` method.

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* Renamed attributes (should be safe to mess with):

- ``_limit`` becomes ``limit``.
- ``_resolution`` becomes ``resolution``.

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* Allowed ``pop(window)`` using any window value (str/bytes/int recommended tho).

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* Fixed ``__len__`` (was returning a string).

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* First release on PyPI.