add in google analytics

templates/layout.jade

@@ -34,3 +34,10 @@ html(lang='en')
             p © #{ new Date().getFullYear() } #{ locals.owner } — powered by 
               a(href='https://github.com/jnordberg/wintersmith') Wintersmith
               //- please leave the "powered by" if you use the design
+    script(type='text/javascript').
+      (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-43062483-1', 'auto');
+      ga('send', 'pageview');