Add Google Analytics to /badge (#1846)

app/views/pages/badge.html.erb

@@ -101,5 +101,15 @@
         }
       }
     </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','https://www.google-analytics.com/analytics.js','ga');
+
+      ga('create', '<%= ApplicationConfig["GA_TRACKING_ID"] %>', 'auto');
+      ga('send', 'pageview');
+      ga('send', 'event', 'view', '/badge version impression', '<%= @html_variant.name %>', null);
+    </script>
   </body>
 </html>