+add utf-8 validation code, not hooked up properly yet

+ws autobahn / Add code to test websocket client compliance with the autobahn test-suite
+Ping received with a payload too large (> 125 bytes) trigger a connection closure
+cobra / add tracking about published messages
+cobra / publish returns a message id, that can be used when
+cobra / new message type in the message received handler when publish/ok is received (can be used to implement an ack system).

ixwebsocket/IXWebSocketTransport.cpp

@@ -590,6 +590,17 @@ namespace ix
                 std::string pingData(_rxbuf.begin()+ws.header_size,
                                      _rxbuf.begin()+ws.header_size + (size_t) ws.N);
 
+                // too large
+                if (pingData.size() > 125)
+                {
+                    std::string reason("reason control frame with payload length > 125 octets");
+                    // Unexpected frame type
+                    close(1002,
+                          reason,
+                          reason.size());
+                    return;
+                }
+
                 if (_enablePong)
                 {
                     // Reply back right away