code: function Promise(back) {
    this.emitter = new EventEmitter();
    this.emitted = {};
    this.ended = false;
    if ('function' == typeof back)
      this.onResolve(back);
  }
docs: Promise constructor.
  
  _NOTE: The success and failure event names can be overridden by setting `Promise.SUCCESS` and `Promise.FAILURE` respectively._
  
  @param {Function} back a function that accepts `fn(err, ...){}` as signature
  @inherits NodeJS EventEmitter http://nodejs.org/api/events.html#events_class_events_eventemitter
  @event `reject`: Emits when the promise is rejected (event name may be overridden)
  @event `fulfill`: Emits when the promise is fulfilled (event name may be overridden)
  @api public