Bulb-channels

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* Static file serving is significantly faster thanks to larger chunk size

* `runworker` now refuses to start if an in memory layer is configured

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* ASGI spec updated to include `order` field for WebSocket messages

* `enforce_ordering` decorator introduced

* DatabaseChannelLayer now uses transactions to stop duplicated messages

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* Fix packaging issues with previous release

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* Staticfiles support in runserver

* Runserver logs requests and WebSocket connections to console

* Runserver autoreloads correctly

* --noasgi option on runserver to use the old WSGI-based server

* --noworker option on runserver to make it not launch worker threads

* Streaming responses work correctly

* Authentication decorators work again with new ASGI spec

* channel_session_user_from_http decorator introduced

* HTTP Long Poll support (raise ResponseLater)

* Handle non-latin1 request body encoding

* ASGI conformance tests for built-in database backend

* Moved some imports around for more sensible layout