Google analytics async snippet - in haml

gistfile1.txt

-# mathiasbynens.be/notes/async-analytics-snippet
:javascript
  var _gaq=[['_setAccount',"#{ENV['GOOGLE_ANALYTICS_ID']}"],['_trackPageview']];
  (function(d,t){var g=d.createElement(t),s=d.getElementsByTagName(t)[0];g.async=1;
  g.src=('https:'==location.protocol?'//ssl':'//www')+'.google-analytics.com/ga.js';
  s.parentNode.insertBefore(g,s)}(document,'script'));