Autobahn

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* new: WAMP call cancel support
* fix: getting started documentation and general docs improvements
* fix: WebSocket auto-reconnect on opening handshake failure
* fix: more Python 3.7 compatibility and CI
* fix: Docker image building using multi-arch, size optimizations and more
* fix: asyncio failed to re-connect under some circumstances (1040,
1041, 1010, 1030)

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* fix: Python 3.7 compatibility
* fix: remove Python 2.6 support leftovers
* new: getting started docker-based examples in matching with docs

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* new: Python 3.7 supported and integrated into CI
* new: WAMP-SCRAM examples
* fix: glitches in WAMP-SCRAM

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* fix: implement abort argument for asyncio in WebSocketAdapterProtocol._closeConnection (1012)

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* fix: security (DoS amplification): a WebSocket server with
permessage-deflate turned on could be induced to waste extra memory
through a "zip-bomb" style attack. Setting a max-message-size will
now stop deflating compressed data when the max is reached (instead
of consuming all compressed data first). This could be used by a
malicious client to make the server waste much more memory than the
bandwidth the client uses.

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* fix: asyncio/rawsocket buffer processing
* fix: example failures due to pypy longer startup time (996)
* fix: add on_welcome for AuthWampCra (992)
* fix: make run() of multiple components work on Windows (986)
* new: `max_retries` now defaults to -1 ("try forever")