Adds Adobe analytics code

Author: aetter

_includes/head.html

@@ -28,6 +28,19 @@
     <script src="https://cdnjs.cloudflare.com/ajax/libs/anchor-js/4.2.0/anchor.min.js"></script>
   {% endif %}
 
+  <!-- SiteCatalyst code version: H.25.1. Copyright 1996-2012 Adobe, Inc. All Rights Reserved -->
+  <script><!--
+  /************* DO NOT ALTER ANYTHING BELOW THIS LINE ! **************/
+  var s_code=s.t();if(s_code)document.write(s_code)//--></script>
+  <script language="JavaScript" type="text/javascript"><!--
+  if(navigator.appVersion.indexOf('MSIE')>=0)document.write(unescape('%3C')+'\!-'+'-')
+  //--></script>
+  <noscript>
+  <img src="//amazonwebservices.d2.sc.omtrdc.net/b/ss/awsamazonalldev2/1/H.25.1--NS/0" height="1" width="1" border="0" alt="" />
+  </noscript>
+  <!--/DO NOT REMOVE/-->
+  <!-- End SiteCatalyst code version: H.25.1. -->
+
   <script type="text/javascript" src="{{ "/assets/js/just-the-docs.js" | absolute_url }}"></script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1">