#1210 $.extend() removed and changed to ch.util.extend(), that it was added
#1210 ui.html, uncomment a modal that was not uncomment when the sintaxs was changed from $. to new ch.Modal
#1210 shortcuts.js & Dropdown.js, event.type was being overwrited, so it is changed to event.shortcut
#1210 ui.html, modal2 has an error when it was instanciated
#1210 util.js, jQuery methods isPlainObject & extend are now in ch.util