Rlog-async

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* Added queue for writting operations

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* [Issue 9](https://github.com/lobziik/rlog/issues/9)
* Added python 3.6 to travis build
* Drop Python 3.3 from travis build
* Tox config changed

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See: [PR 8](https://github.com/lobziik/rlog/pull/8)

* Added passing redis client settings as kwargs
* Custom formatter support
* Message expiring support for _RedisListHandler_
* Drop Python 3.2 support