View application.html.erb
<%# Put this code snippet between the <head></head>-tags in your application layout and %>
<%# replace 'UA-XXXXXXXX-X' with your own unique Google Analytics Tracking ID %>
<%# ... %>
<head>
<%# ... %>
<% if Rails.env.production? %>
<script type="text/javascript">
(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),