fixed <input>/<select>/<form> event handling

using clone() does not copy all the bindings necessary to allow html
forms to function correctly. Previously if a form elment (input, radio,
select) was contained within the pageslider values set by a user could
not be obtained programatically via $('selector').val(). Setting these
values programmatically worked OK but would not visually update the
field/dom.

fixes: #84