Issue: The onkeyup event should not be triggered during init.
	- Replace the content of telInput.keyup with the call of a new internal method called _performKeyUpAction.
	- instead of triggering the key up event call _performKeyUpAction.

Issue: the keyup event should be triggered when a new country is changed.
	- trigger on keyup when selecting a new flag

New public function added: val
	- this function allows to programmatically set the value of the phone number and update the flag at the same time.