code: function() {
              this.options.route = 'done';
              this.options.collection = new TodoList(todos.done());
              this.options.toggleItem = _.bind(this.toggleItem, this);
              this.options.refreshModel = _.bind(this.refreshModel, this);
          }
docs: No `addItem` here, collection is a subset of todos, as returned by `todos.done()`