website: add GA tracker

website/source/layouts/layout.erb

@@ -15,6 +15,18 @@
 		<!-- js -->
 		<%= javascript_include_tag "prettify" %>
 
+		<!-- analytics -->
+		<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', 'UA-43075859-1', 'packer.io');
+			ga('send', 'pageview');
+
+		</script>
+
 		<!-- fonts -->
 		<link href='http://fonts.googleapis.com/css?family=Inconsolata' rel='stylesheet' type='text/css'>
 		<script type="text/javascript" src="//use.typekit.net/apr3jjs.js"></script>