Channels

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* New CHANNELS_WS_PROTOCOLS setting if you want Daphne to accept certain
subprotocols

* WebsocketBindingWithMembers allows serialization of non-fields on instances

* Class-based consumers have an .as_route() method that lets you skip using
route_class

* Bindings now work if loaded after app ready state

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* Bindings now require that `fields` is defined on the class body so all fields
are not sent by default. To restore old behaviour, set it to ['__all__']

* Bindings can now be declared after app.ready() has been called and still work.

* Binding payloads now include the model name as `appname.modelname`.

* A worker_ready signal now gets triggered when `runworker` starts consuming
messages. It does not fire from within `runserver`.

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* Data Binding framework is added, which allows easy tying of model changes
to WebSockets (and other protocols) and vice-versa.

* Standardised WebSocket/JSON multiplexing introduced

* WebSocket generic consumers now have a 'close' argument on send/group_send

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* WebsocketConsumer now has a http_user option for auto user sessions.

* consumer_started and consumer_finished signals are now available under
channels.signals.

* Database connections are closed whenever a consumer finishes.

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* websocket.connect and websocket.receive are now consumed by a no-op consumer
by default if you don't specify anything to consume it, to bring Channels in
line with the ASGI rules on WebSocket backpressure.

* You no longer need to call super's setUp in ChannelTestCase.

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* Class based consumers now have a self.kwargs

* Fixed bug where empty streaming responses did not send headers or status code