Google analytics code snippet for ghost blog.

gistfile1.js

//These lines were added in core/server/helpers/index.js
//on line 225, towards the end of the function: ghost.registerThemeHelper('ghost_head'..

var ga_code= "<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');"

head.push(ga_code);
head.push("ga('create', '[your analytics site id]', '[your domain]');");
head.push("ga('send', 'pageview');</script>");