[Bookmarklet] Add batch action for updating due per List

trello.js

(function(authToken){
    var containerClsName = 'batch_due_action_container';

    var initialize = function() {
      $('.' + containerClsName).remove();

      $('.list').each(function(){
          var $list = $(this);
          var $form = $('<form class="' + containerClsName + '">')
            .appendTo($list.find('.list-header'));
          var $input = $('<input type="text" placeholder="YYYYMMDD" maxlength="8" size="10">')
            .appendTo($form);
          $form.on('submit', function(e){
              e.preventDefault();
              var dateStr = $input.val();
              var date = new Date(0);
              date.setFullYear(parseInt(dateStr.slice(0, 4)));
              date.setMonth(parseInt(dateStr.slice(4, 6)) - 1);
              date.setDate(parseInt(dateStr.slice(6)));
              $list.find('.list-card .list-card-details .list-card-title')
                .each(function(){
                    Trello.put('cards/' + $(this).attr('href').split('/')[2], {
                        due: date.getTime()
                    });
                });
          });
      });
    };

    $.getScript('https://trello.com/1/client.js?key=' + authToken, function(){
        Trello.authorize({
            interactive: false,
            success: initialize,
            error: function(){
              alert('You need to authorize Trello');
              Trello.authorize({
                  type: "popup",
                  expiration: "never",
                  scope: { read: true, write: true },
                  success: initialize
              });
            }
        });
    });

})('<API Key>');