Track visits to docs with GA.

doc-src/layouts/default.haml

@@ -24,3 +24,4 @@
          e.after('<span class="swatch" style="background-color:'+e.text()+';"></span>');
         });
       });
+    = render "partials/analytics"

doc-src/layouts/example.haml

@@ -11,3 +11,5 @@
     #container
       #main
         = yield
+
+    = render "partials/analytics"

doc-src/layouts/partials/analytics.html

@@ -0,0 +1,9 @@
+<script type="text/javascript">
+var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
+document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
+</script>
+<script type="text/javascript">
+try {
+var pageTracker = _gat._getTracker("UA-6779438-1");
+pageTracker._trackPageview();
+} catch(err) {}</script>