Adding Google analytics tracking code

To add google analytics to your theme, you need add this code to the theme.xml

   
    <tag>
    <name>script</name>
      <output>yes</output>
      <prefix></prefix>
      <suffix></suffix>
      <attributes>
          <type>text/javascript</type>
      </attributes>
      <value>
(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', 'your tracking code', 'auto');
ga('send', 'pageview');
      </value>
  </tag>