Added pipe demo and make sendMsg() puplic in plugin client library

Change-Id: I38ee2d8cec2804d0c13abf97455ccc78411df5ed
diff --git a/dev/js/src/plugin/server.js b/dev/js/src/plugin/server.js
index 1c46dbe..d5c9cfb 100644
--- a/dev/js/src/plugin/server.js
+++ b/dev/js/src/plugin/server.js
@@ -393,6 +393,17 @@
       case 'log':
         KorAP.log(d.code, d.msg,  service.src);
         break;
+
+      // Modify pipes
+      case 'pipe':
+        if (KorAP.Pipe != undefined) {
+          if (d.job == 'del') {
+            KorAP.Pipe.remove(d.service);
+          } else {
+            KorAP.Pipe.append(d.service);
+          };
+        };
+        break;
       };
 
       // TODO: