make most of the messenger api async

www/contacts/main.less

@@ -52,6 +52,7 @@ body {
     width: 350px;
     height: 100%;
     background-color: lighten(@bg-color, 10%);
+    overflow-y: auto;
     .friend {
         background: rgba(0,0,0,0.1);
         padding: 5px;