Updates for callendar

I changed next files
modules\mod_k2_tools\includes\calendarClass.php
modules\mod_k2_tools\mod_k2_tools.xml
modules\mod_k2_tools\helper.php
modules\mod_k2_tools\tmpl\calendar.php

components\com_k2\models\itemlist.php
components\com_k2\controllers\itemlist.php
components\com_k2\js\k2.js