Fix Address.required_fields to handle all presence validators
Fix Address.required_fields to handle all presence validators

rbngzlv/spree_address_book,redglory/spree_address_book,rbngzlv/spree_address_book,deseretbook/spree_address_management,romul/spree_address_book,magiclabs/spree_address_book,magiclabs/spree_address_book,shohrukh/spree_address_book,dkirsche/spree_address_book,romul/spree_address_book,redglory/spree_address_book,shohrukh/spree_address_book,deseretbook/spree_address_management,shohrukh/spree_address_book,rbngzlv/spree_address_book,deseretbook/spree_address_management,renuo/spree_address_book,dkirsche/spree_address_book,dkirsche/spree_address_book,renuo/spree_address_book,magiclabs/spree_address_book,redglory/spree_address_book,renuo/spree_address_book