Channels

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* Channels now includes a JavaScript wrapper that wraps reconnection and
multiplexing for you on the client side.

* Test classes have been moved from ``channels.tests`` to ``channels.test``.

* Bindings now support non-integer fields for primary keys on models.

* The ``enforce_ordering`` decorator no longer suffers a race condition where
it would drop messages under high load.

* ``runserver`` no longer errors if the ``staticfiles`` app is not enabled in Django.

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* Database connections are no longer force-closed after each test is run.

* Channel sessions are not re-saved if they're empty even if they're marked as
modified, allowing logout to work correctly.

* WebsocketDemultiplexer now correctly does sessions for the second/third/etc.
connect and disconnect handlers.

* Request reading timeouts now correctly return 408 rather than erroring out.

* The ``rundelay`` delay server now only polls the database once per second,
and this interval is configurable with the ``--sleep`` option.

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* Websockets can now be closed from anywhere using the new ``WebsocketCloseException``.
There is also a generic ``ChannelSocketException`` so you can do custom behaviours.

* Calling ``Channel.send`` or ``Group.send`` from outside a consumer context
(i.e. in tests or management commands) will once again send the message immediately.

* The base implementation of databinding now correctly only calls ``group_names(instance)``,
as documented.

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* WebSocket generic views now accept connections by default in their connect
handler for better backwards compatibility.

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* BREAKING CHANGE: WebSockets must now be explicitly accepted or denied.
See https://channels.readthedocs.io/en/latest/releases/1.0.0.html for more.

* BREAKING CHANGE: Demultiplexers have been overhauled to directly dispatch
messages rather than using channels to new consumers. Consult the docs on
generic consumers for more: https://channels.readthedocs.io/en/latest/generics.html

* BREAKING CHANGE: Databinding now operates from implicit group membership,
where your code just has to say what groups would be used and Channels will
work out if it's a creation, modification or removal from a client's
perspective, including with permissions.

* Delay protocol server ships with Channels providing a specification on how
to delay jobs until later and a reference implementation.

* Serializers can now specify fields as `__all__` to auto-include all fields.

* Various other small fixes.

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* channel_session now also rehydrates the http session with an option

* request.META['PATH_INFO'] is now present

* runserver shows Daphne log messages

* runserver --nothreading only starts a single worker thread

* Databinding changed to call group_names dynamically and imply changed/created from that;
other small changes to databinding, and more changes likely.