Export QDeclarativeContactInvalidFilter and QDeclarativeOrganizerItemInvalidFilter to QML.

This filter can be used to clear the contact/organizer model.

Change-Id: Ie4b831dd353556e9ab6816a7a708348fb10e9b27
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>