replicated opml storage: improvements, update scenario test

examples/scenario_monitor.html

@@ -10,6 +10,7 @@
 
   <link rel="stylesheet" href="../node_modules/grunt-contrib-qunit/test/libs/qunit.css" type="text/css" media="screen"/>
   <script src="../node_modules/grunt-contrib-qunit/test/libs/qunit.js" type="text/javascript"></script>
+  <script src="../node_modules/sinon/pkg/sinon.js" type="text/javascript"></script>
   <script src="scenario_monitor.js"></script>
 </head>