Function defer

lib/test/angular/1.5.0/angular.js:15494–15501

()

   * @returns {Deferred} Returns a new instance of deferred.
   */
  var defer = function() {
    var d = new Deferred();
    //Necessary to support unbound execution :/
    d.resolve = simpleBind(d, d.resolve);
    d.reject = simpleBind(d, d.reject);
    d.notify = simpleBind(d, d.notify);
    return d;
  };

  function Promise() {
    this.$$state = { status: 0 };