Added Google analytics tracking info to header template.
diff --git a/site/_includes/head.html b/site/_includes/head.html
index ac0f84c..c3d9e1b 100755
--- a/site/_includes/head.html
+++ b/site/_includes/head.html
@@ -19,6 +19,19 @@
 <script src="../js/toc.js"></script>
 <script src="../js/customscripts.js"></script>
 <link rel="shortcut icon" href="../common_images/favicon.ico" type="image/x-icon">
+
+<!-- Add google analytics tracking info -->
+<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','https://www.google-analytics.com/analytics.js','ga');
+
+  ga('create', 'UA-89864500-1', 'auto');
+  ga('send', 'pageview');
+
+</script>
+
 <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
 <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
 <!--[if lt IE 9]>
@@ -32,4 +45,4 @@
 
 
 
- 
\ No newline at end of file
+