Rexpro

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* Robust Reconnect and session handling
* Allow Gevent, Eventlet and native python socket implementations
* Concurrency options are optional to use the library
* To install with gevent: ``pip install rexpro[gevent]``
* To install with eventlet: ``pip install rexpro[eventlet]``
* Documentation Improvements

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* Naive Reconnect

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* Documentation

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* Reconnect handling
* Testing against Celery
* must use ``-P gevent`` flag, ``eventlet`` is known to immediately hang forever

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* Hotfix for connection pooling context manager

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* Connection Pooling and Green Thread Friendly sockets using the ``gevent`` library.
* Using gevent.socket directly, no monkey patching.