code: function() {
      this._super();
  
      set(this, 'stateMeta', Ember.Map.create());
  
      var initialState = get(this, 'initialState');
  
      if (!initialState && get(this, 'states.start')) {
        initialState = 'start';
      }
  
      if (initialState) {
        this.transitionTo(initialState);
        Ember.assert('Failed to transition to initial state "' + initialState + '"', !!get(this, 'currentState'));
      }
    }
docs: When creating a new statemanager, look for a default state to transition
  into. This state can either be named `start`, or can be specified using the
  `initialState` property.