Sockjs

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- Fixed compatibility with aiohttp 3.0+ (169)

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- Fixed support for aiohttp 2.0+.

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- Mark SockJSRoute.handler and SockJSRoute.websocket as coroutines. 25

- Remove a check for "ORIGIN" header 12

- Process FRAME_MESSAGE_BLOB message type 12

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- Fixed lost event-loop argument in `sockjs.transports.websocket.WebSocketTransport`
- Fixed lost event-loop argument in `sockjs.transports.rawwebsocket.RawWebSocketTransport`
- Fixed RawRequestMessage. Add raw_header argument (aiohttp 0.21+)
- Fixed many warnings
- Fixed `sockjs.route` add_endpoint without name bug

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- Fixed calls of ``SessionManager.aquire()`` - was removed the unnecessary second argument.
- Fixed the incorrect argument in one call of ``cors_headers()``.
- Fixed many errors. The code is not perfect, but at least it was working as it should.

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- Fixed packaging