Day items modify

[cf-git]

Hello. I need edit displayed day items. Please append date value to "createItem" object for days on next release. Some like this:

items.push(this.createItem({
        disabled: _disabled2,
        picked: _picked,
        date: _date,
        highlighted: viewYear === thisYear && viewMonth === thisMonth && _date.getDate() === thisDay,
        text: i,
        view: _disabled2 ? 'day disabled' : view
      }));