Make analytics selector more selective.

Promote_Graph rows use 'promotedlink' and 'promoted' classes to get
the same styling as promoted links. Their destination urls were getting
rewritten by analytics.js which was treating them as real promoted links.

r2/r2/public/static/js/analytics.js

@@ -5,7 +5,7 @@ r.analytics = {
     init: function() {
         // these guys are relying on the custom 'onshow' from jquery.reddit.js
         $(document).delegate(
-            '.promotedlink.promoted',
+            '.promotedlink.promoted:not(.blob)',
             'onshow',
             _.bind(function(ev) {
                 this.fetchTrackersOrFirePixel(ev.target)