Flask-and-redis

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* Added ``redis`` as install requirement in ``setup.py``.

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* Move from ``flask_redis`` package to python module.
* Little improvements for storing ``_flask_app`` attribute to :class:`~.Redis`
instance.

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* Implement :meth:`~.Redis.init_app` method.

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* Convert ``REDIS_PORT`` to an ``int`` instance.

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* Added support of ``REDIS_URL`` setting. By default, :class:`~.Redis` will try
to guess host, port, user, password and db settings from that value.

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* Initial release.