Channels

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* The ``runserver`` ``server_cls`` override no longer fails with more modern
Django versions that pass an ``ipv6`` parameter.

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* The Daphne dependency requirement was bumped to 1.3.0.

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* Pending messages correctly handle retries in backlog situations

* Workers in threading mode now respond to ctrl-C and gracefully exit.

* ``request.meta['QUERY_STRING']`` is now correctly encoded at all times.

* Test client improvements

* ``ChannelServerLiveTestCase`` added, allows an equivalent of the Django
``LiveTestCase``.

* Decorator added to check ``Origin`` headers (``allowed_hosts_only``)

* New ``TEST_CONFIG`` setting in ``CHANNEL_LAYERS`` that allows varying of
the channel layer for tests (e.g. using a different Redis install)

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* ``enforce_ordering`` now works correctly with the new-style process-specific
channels

* ASGI channel layer versions are now explicitly checked for version compatibility

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* Session name hash changed to SHA-1 to satisfy FIPS-140-2. Due to this,
please force all WebSockets to reconnect after the upgrade.

* `scheme` key in ASGI-HTTP messages now translates into `request.is_secure()`
correctly.

* WebsocketBridge now exposes the underlying WebSocket as `.socket`

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* Fixed JS packaging issue