Autobahn

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* new: WAMP-SCRAM authentication
* new: native vector extensions (NVX)
* fix: improve choosereactor (965, 963)
* new: lots of new and improved documentation, component API and more
* new: Docker image tooling now in this repo
* fix: "fatal errors" in Component (977)
* fix: AIO/Component: create a new loop if already closed
* fix: kwarg keys sometimes are bytes on Python2 (980)
* fix: various improvements to new component API

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* fix: endpoint configuration error messages (942)
* fix: various improvements to the new components API (including retries)
* fix: pass `unregisterProducer` through to twisted to complement `WebSocketAdapterProtocol.registerProducer` (875)

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* fix: proxy support (918)
* fix: ensure that a future is not done before rejecting it (919)
* fix: don't try to reject cancelled futures within pending requests when closing the session

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`Published 2017-09-23 <https://pypi.python.org/pypi/autobahn/17.9.3>`__

* new: user configurable backoff policy
* fix: close aio loop on exit
* fix: some component API cleanups
* fix: cryptosign on py2
* new: allow setting correlation_is_last message marker in WAMP messages from user code

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`Published 2017-09-12 <https://pypi.python.org/pypi/autobahn/17.9.2>`__

* new: allow setting correlation URI and anchor flag in WAMP messages from user code
* fix: WebSocket proxy connect on Python 3 (unicode vs bytes bug)

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`Published 2017-09-04 <https://pypi.python.org/pypi/autobahn/17.9.1>`__

* new: allow setting correlation ID in WAMP messages from user code
* fix: distribute LICENSE file in all distribution formats (using setup.cfg metadata)