Add google analytics to App.js

lib/components/App.js

@@ -46,6 +46,14 @@ export default class App extends React.Component {
           ? <RouteHandler />
           : <ErrorPage />}
         <script>FilePizza()</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-62785624-1', 'auto');
+        ga('send', 'pageview');
+        </script>
       </body>
     </html>
   }