Pass items to onAfterPageLoad

When using masonry or isotope it's necessary to know the items which have to be relayouted. This change passes the items that were extracted of the response to the `onAfterPageLoad` callback. Using that, efficient relayouting can be accomplished by using isotope's `appended` method with the passed items.

src/shortcuts/infinite.js

@@ -51,7 +51,7 @@
           this.$more.remove()
         }
 
-        this.options.onAfterPageLoad()
+        this.options.onAfterPageLoad($items)
       }, this))
     }, this)
   }