promote form/question/option to a standard type (#602)
code review notes
made multiselect box disabled unless there are zero option levels
made changing option levels make form dirty
added add level link
fixed ref to option set modal
refactored draggable to allow new method
added new class to elmo form fields
added event handler for option level add link
removed console.log
made show modals with correct titles
made add dialog work with modal and view
turned on multilevel support
fixed bug with save_item
fixed ol styles
enabled recursive removal for nested items
fixed crash for nil key datetime question values (closes #968)
fixed failing test
fixed old option_sets path reference
refactored option_set_form.js submit handler