_includes/scripts.html

<script type="text/javascript">
  var BASE_URL = '{{ site.url }}';
</script>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="{{ site.url }}/assets/js/vendor/jquery-1.9.1.min.js"><\/script>')</script>
<script src="{{ site.url }}/assets/js/scripts.min.js"></script>

{% if site.owner.google.analytics %}
<!-- Asynchronous Google Analytics snippet -->
<script>
  var _gaq = _gaq || [];
  var pluginUrl =
 'https://www.google-analytics.com/plugins/ga/inpage_linkid.js';
  _gaq.push(['_require', 'inpage_linkid', pluginUrl]);
  _gaq.push(['_setAccount', '{{ site.owner.google.analytics }}']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = 'https://stats.g.doubleclick.net/dc.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>
{% endif %}