beautifulSA-jekyll/_includes/google_analytics.html

{% if site.google_analytics %}
<!-- Google Analytics -->
<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', 'https://www.google-analytics.com/analytics.js', 'ga');
  ga('create', '{{ site.google_analytics }}', 'auto');
  ga('send', 'pageview');
</script>
<!-- End Google Analytics -->
{% endif %}