Use live binding for tipsy tooltips within stream elements, so that elements loaded by the infiniscroll get them too

public/javascripts/stream.js

@@ -13,7 +13,8 @@ var Stream = {
     $.each(["a.stream_element_delete", "a.comment_delete", "span.post_scope"], function(idx, el){
       $(el).tipsy({
         trigger: "hover",
-        gravity: "n"
+        gravity: "n",
+        live: true
       });
     });