Only render GA tracking code in production

_includes/footer.html

@@ -24,6 +24,7 @@
   <div class="text-center">
   </div>
 </div>
+{% if jekyll.environment != 'development' %}
 <script>
   window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
   ga('create', 'UA-102577034-2', 'auto');
@@ -35,5 +36,6 @@
 </script>
 <script async src="https://www.google-analytics.com/analytics.js"></script>
 <script async src="/assets/js/autotrack.js"></script>
+{% endif %}
 <script async src="https://buttons.github.io/buttons.js"></script>
 <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>