google_analytics.erb

<script src="/javascripts/app.js" type="text/javascript" charset="utf-8"></script>

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("<%= ENV['GOOGLE_ANALYTICS_WEB_PROPERTY_ID'] %>");
pageTracker._trackPageview();
} catch(err) {}</script>