non-blocking connection

Asynchronous connections: NetworkController::connect() behaviour modified. Now it performs a non-blocking connection.
Reduced slightly the websocket latency.
Adapter API modified to handle easily handshakes.
Fixed websocket issue that could offer an accepted websocket that was not valid (the websocket handshake could have failed).
Added NetworkController::is_ready()
Added SendStatus::ResourceNotAvailable

lemunozm / message-io