code: function(views, start, removed) {
      if (removed === 0) { return; }
  
      var changedViews = views.slice(start, start+removed);
      this.initializeViews(changedViews, null, null);
  
      this.invokeForState('childViewsWillChange', views, start, removed);
    }
docs: When a child view is removed, destroy its element so that
  it is removed from the DOM.
  
  The array observer that triggers this action is set up in the
  `renderToBuffer` method.
  
  @private
  @param {Ember.Array} views the child views array before mutation
  @param {Number} start the start position of the mutation
  @param {Number} removed the number of child views removed