code: def get_folder_args(opts)
        opts[:base_shape] ||= 'Default'
        default_args = {
          :folder_ids   => [{:id => self.id, :change_key => self.change_key}],
          :folder_shape => {:base_shape => opts[:base_shape]}
        }
        default_args.merge(opts)
      end
docs: Build up the arguements for #get_folder
   @todo: should we really pass the ChangeKey or do we want the freshest obj?