code: public Organizer setOrganizer(String email) {
  		Organizer prop = (email == null) ? null : new Organizer(null, email);
  		setOrganizer(prop);
  		return prop;
  	}
docs: Sets the organizer of the journal entry.
  @param email the organizer's email address (e.g. "johndoe@example.com")
  or null to remove
  @return the property that was created
  @see <a href="http://tools.ietf.org/html/rfc5545#page-111">RFC 5545
  p.111-2</a>
  @see <a href="http://tools.ietf.org/html/rfc2445#page-106">RFC 2445
  p.106-7</a>