playground: Separating analytics script and adding an empty one.
Correct analytics script will be copied over at deployment time.

Change-Id: Iaf12d2f1050d3342bdc7f3742355f00c27b9ee13
diff --git a/client/public/analytics.js b/client/public/analytics.js
new file mode 100644
index 0000000..f315304
--- /dev/null
+++ b/client/public/analytics.js
@@ -0,0 +1,6 @@
+// Copyright 2015 The Vanadium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Empty analytics stub
+// This file can be overwritten to include Google Analytics if desired.
\ No newline at end of file
diff --git a/client/public/index.html b/client/public/index.html
index a0d203e..a7a6a15 100644
--- a/client/public/index.html
+++ b/client/public/index.html
@@ -43,16 +43,7 @@
 
   <!-- NOTE: Avoid the async attribute to prevent a brief flash of un-styled content -->
   <script src="/bundle.js"></script>
-
-  <script>
-    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-    })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-
-    ga('create', 'UA-59720824-3', 'auto');
-    ga('send', 'pageview');
-  </script>
+  <script src="/analytics.js"></script>
 </head>
 <body></body>
 </html>