Sockjs

------------------

- Fix heartbeat (214)

------------------

- Fix compatibility with aiohttp 3.0+ again.

------------------

- Fixed compatibility with aiohttp 3.0+ (169)

----------------

- Fixed support for aiohttp 2.0+.

----------------

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

- Remove a check for "ORIGIN" header 12

- Process FRAME_MESSAGE_BLOB message type 12

----------------

- 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