add google analytics

app/index.html

@@ -45,6 +45,17 @@
     <div id="site-canvas"></div>
     <script src="//api.tiles.mapbox.com/mapbox.js/plugins/turf/v2.0.0/turf.min.js" type="text/javascript"></script>
     <script src="assets/scripts/main.js" type="text/javascript"></script>
+    <!-- google analytics -->
+    <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-88478-52', 'auto');
+      ga('send', 'pageview');
+
+    </script>
   </body>
 
 </html>