No ability to respond to client requested ack

[TronPaul]

On client requested ack, gevent-socketio expects a handler to have return arguments https://github.com/abourget/gevent-socketio/blob/e2389b25933e1953fbbd5fa1d226c1b8e584565d/socketio/virtsocket.py#L403. Decorated methods' return values should be passed back up the stack to gevent-socketio.

[TronPaul]

Think I fixed it in #11, but client requested acks can't be unit tested yet. That should be solved before closing this issue.

[TronPaul]

Looking at the gevent-socketio library adding this to received wouldn't be correct because the return value of the handler methods isn't sent in an ack unless requested by the client. I think I'd store all the return values of the handlers in a list on the socket. Will add pull request.

[TronPaul]

The pull request now solves both parts of the issue. The test client now returns what was returned by recv_*. Code that wishes to test acks can now store that return value and assert on it. No checks are made if it can or cannot be sent by the library (is it jsonable, etc).

[miguelgrinberg]

Closing, since this is fixed by #11