Django-redis

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- Improve docs (by dkingman).
- Fix missing imports on sentinel client (by opapy).
- Connection closing improvements on sentinel client (by opapy).

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- Add support for django's ``KEY_FUNCTION`` and ``REVERSE_KEY_FUNCTION`` (by teferi)
- Accept float value for socket timeout.
- Fix wrong behavior of ``DJANGO_REDIS_IGNORE_EXCEPTIONS`` with socket timeouts.
- Backward incompatible change: now raises original exceptions instead of self defined.

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- Add ttl method purposed to be included in django core.
- Add iter_keys method that uses redis scan methods for memory efficient keys retrieval.
- Add version keyword parameter to keys.
- Deprecate django 1.3.x support.

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- Fix wrong import on sentinel client.

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- Add pluggable connection factory.
- Negative timeouts now works as expected.
- Delete operation now returns a number of deleted items instead of None.

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- Fixed redis-py < 2.9.0 incompatibilities
- Fixed runtests error with django 1.7