Move utility templates to prefix '_', add footer utility templates.

Utility templates moved to have '_' prefix similar to how sass files are.
Aditional templates for article and page footer contents now used to load
comments etc.

templates/_gosquared.html

@@ -0,0 +1,17 @@
+<!-- GoSquared Tracking -->
+<script type="text/javascript">
+var GoSquared = {};
+GoSquared.acct = "{{ GO_SQUARED }}"; // account number
+(function(w){
+  function gs(){
+    w._gstc_lt = +new Date;
+    var d = document, g = d.createElement("script");
+    g.type = "text/javascript";
+    g.src = "//d1l6p2sc9645hc.cloudfront.net/tracker.js";
+    var s = d.getElementsByTagName("script")[0];
+    s.parentNode.insertBefore(g, s);
+  }
+  w.addEventListener ?
+    w.addEventListener("load", gs, false) :
+    w.attachEvent("onload", gs);
+})(window);