if you watch the layout.html you'll find the snippet.
{{if response.google_analytics_id:}}<script type="text/javascript"> var
_gaq = _gaq || []; _gaq.push(['_setAccount',
'{{=response.google_analytics_id}}']); _gaq.push(['_trackPageview']);
(function() { var ga = document.createElement('script'); ga.type =
'text/javascript'; ga.async = true; ga.src = ('https:' ==
document.location.protocol ? 'https://ssl' : 'http://www') +
'.google-analytics.com/ga.js'; var s =
document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga,
s); })(); </script> {{pass}}
just before the closing </body> tag.
Short version: if you set response.google_analytics_id, that snippet is
inserted into the page and allows tracking from google analytics, without
any additional code.
