Pass canceller into the Deferred constructor

promise.js

@@ -131,8 +131,8 @@ Promise.prototype.wait = function(){
 Deferred.prototype = Promise.prototype;
 // A deferred provides an API for creating and resolving a promise.
 exports.Promise = exports.Deferred = exports.defer = defer;
-function defer(){
-  return new Deferred();
+function defer( canceller ){
+  return new Deferred( canceller );
 } 
 
 var contextHandler = exports.contextHandler = {};