{% if site.google_tracking_id %}
<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');

  ga('create', '{{ site.google_tracking_id }}', 'auto');
  ga('send', 'pageview');

</script>
{% endif %}

{% if site.google_tracking_id %}
<script>
  if (window.location.hostname != 'localhost') {
    (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');

    ga('create', '{{ site.google_tracking_id }}', 'auto');
    ga('send', 'pageview');
  }

</script>
{% endif %}

Disable Google Analytics if running locally
Disable Google Analytics if running locally
