Implement requestMsg() for client-server-communication to receive data from the server

Change-Id: I6399679449199a3f5e75ca47348b4fd875f08142
diff --git a/dev/demo/plugin-client.html b/dev/demo/plugin-client.html
index 0250c6c..3cce6de 100644
--- a/dev/demo/plugin-client.html
+++ b/dev/demo/plugin-client.html
@@ -27,7 +27,7 @@
       function flood () {
         var i = 0;
         for (; i < 90; i++) {
-          KorAPlugin._sendMsg({
+          KorAPlugin.sendMsg({
             'action' : '-'
           });
         };
@@ -57,6 +57,7 @@
       <li><a onclick="KorAPlugin.resize()">Resize</a></li>
       <li><a onclick="KorAPlugin.sendMsg({'action':'pipe','service':'Glemm'})">Add Glemm</a></li>
       <li><a onclick="flood()">Flood!</a></li>
+      <li><a onclick="KorAPlugin.requestMsg({'action':'get', 'key':'KQ'}, function (d) { document.write(JSON.stringify(d.value))})">Get KQ</a></li>
     </ul>
     <p style="width: 2000px">------------------------------------------------------------------------------------------------------------------------</p>
   </body>