[minor] Comment out atime until it's logic is added

lib/resourceful/resource.js

@@ -655,7 +655,7 @@ Resource.timestamps = function () {
   //
   // The last time the resource was accessed
   //
-  this.property('atime', 'number', { format: "unix-time", private: true });
+  // TODO: this.property('atime', 'number', { format: "unix-time", private: true });
 };
 
 Resource.define = function (schema) {