google analyics liquid tag added

_config.yml

@@ -24,6 +24,8 @@ scholar_authorid: # put your google scholar author id
 contact_note: >
   You can even add a little note about which of these is the best way to reach you.
 
+google_analytics: UA-XXXXXXXXX # out your google-analytics code
+
 # -----------------------------------------------------------------------------
 # Blog
 # -----------------------------------------------------------------------------

_includes/hemline.html

@@ -31,6 +31,6 @@
 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', 'UA-XXXXXXXX-X', 'auto');
+ga('create', '{{ site.google_analytics }}', 'auto');
 ga('send', 'pageview');
 </script>