Django-redis

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- Add additional check for avoid wrong exception on ``get_redis_connection``.

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- Make redis client pluggable (thanks to arnuschky)
- Add version number inside python module (thanks to BertrandBordage)
- Fix clear method (thanks to ostcar)
- Add the ability to specify key prefix on delete and delete_pattern.
- BREAKING CHANGE: improved compression support (make it more plugable).

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- Improved exception handling in herd client (thanks to brandoshmando)
- Fix bug that not allows use generators on delete_many (thanks to ostcar).
- Remove obsolete code that makes hard dependency to mspack.

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- Add ``persist`` and ``expire`` methods.
- Remove old and broken dummy client.
- Expose a redis lock method.

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- Add plugable serializers architecture (thanks to jdufresne)
- Add json serializer (thanks to jdufresne)
- Add msgpack serializer (thanks to uditagarwal)
- Implement delete_pattern using iter_scan for better performance (thanks to lenzenmi)

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- Remove usage of deprecated ``get_cache`` method.
- Added connection option SOCKET_CONNECT_TIMEOUT. [Jorge C. Leitão].
- Replace ``setex`` and friends with set, because it now supports all need for atomic.
updates (thanks to 23doors) (re revert changes from 3.8.x branch).
- Fix django 1.8 compatibilities.
- Fix django 1.9 compatibilities.
- BREAKING CHANGE: Now timeout=0 works as django specified (expires immediately)
- Now requires redis server >= 2.8
- BREAKING CHANGE: ``redis_cache`` is no longer a valid package name