Update templates

The following updates are made:
- index.html now lists the site description along with X articles
- _list_item.html universalizes code for iterating over the articles
- _site_social.html is merged into base.html
- _google_search.html is added for custom search support
- _gosquared.html, _google_analytics.html have minor formatting changes
- archives.html displays a one page list of all articles
- period_archives.html is removed as it is not planned for implementation atm
- tags.html general clean up and tweaks
- base.html now has
  - full rss/atom feed support
  - disqus comment count support on links (not used yet)
  - blog links in aside
  - search in aside

templates/_gosquared.html

@@ -1,17 +1,18 @@
-<!-- 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);
+  <!-- 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);
+  </script>