mailing_list.go
func (ml *MailingList) Subscriber(email, name string) *Subscriber {
	return &Subscriber{MailingList: ml, Email: email, RealName: name}
}
func (ml *MailingList) Subscriber(email, name string) *Subscriber {
	return &Subscriber{MailingList: ml, Email: email, RealName: name}
}
// Subscriber create a Subscriber type from a MalingList, with the given email
// and name