Connect asynchronously on JVM platforms to match behaviour on GWT

common/src/main/java/com/github/czyzby/websocket/impl/NvWebSocket.java

@@ -23,7 +23,7 @@ public void connect() throws WebSocketException {
             dispose();
             final WebSocket currentWebSocket = webSocket = webSocketFactory.createSocket(getUrl());
             currentWebSocket.addListener(new NvWebSocketListener(this));
-            currentWebSocket.connect();
+            currentWebSocket.connectAsynchronously();
         } catch (final Throwable exception) {
             throw new WebSocketException("Unable to connect.", exception);
         }