Asyncio-redis

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Fixes:
- Correctly handle CancelledError.
- Passing of both host and port variables in unit tests.
- Using the correct loop during reconnect in Connection.

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Fixes:
- Passing a custom loop should now work everywhere. (Unit tests added.)

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New features:
- _asdict suffixes for methods that have a ZRangeReply return-annotation.
- Added ZREVRANGE

Fixes:
- Encoding of negative integers
- Fixes in the MOVE and PUNSUBSCRIBE
- Using separate logger
- Fix when transmitting large replies over the network.

Backward-incompatibilities:
- Iterating through a DictReply or ZRangeReply now yields futures that return
(key, value) tuples instead of {key:value} dicts of one element. (This
behaviour was not really documented and it certainly is an improvement.)

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New features:
- Timeout support for blpop/brpop/brpoplpush
- setup.py improved. Don't install asyncio on Python 3.4

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