Add GA snippet to doc page template.

Author: myronmarston

docs-template/default/layout/html/footer.erb

@@ -0,0 +1,16 @@
+<div id="footer">
+  Generated on <%= Time.now.strftime("%c") %> by
+  <a href="http://yardoc.org" title="Yay! A Ruby Documentation Tool" target="_parent">yard</a>
+  <%= YARD::VERSION %> (ruby-<%= RUBY_VERSION %>).
+</div>
+
+<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-59095215-1', 'auto');
+  ga('send', 'pageview');
+
+</script>