docs: function (collection, ViewClass, container, opts) {
          var containerEl = (typeof container === 'string') ? this.query(container) : container;
          var config = assign({
              collection: collection,
              el: containerEl || this.el,
              view: ViewClass,
              parent: this,
              viewOptions: {
                  parent: this
              }
          }, opts);
          var collectionView = new CollectionView(config);
          collectionView.render();
          return this.registerSubview(collectionView);
      }