code: public CalendarUserType getCalendarUserType() {
  		String value = first(CUTYPE);
  		return (value == null) ? null : CalendarUserType.get(value);
  	}
docs: <p>
  Gets the CUTYPE (calendar user type) parameter value.
  </p>
  <p>
  This parameter is used by the {@link Attendee} property. It defines the
  type of object that the attendee is (for example, an "individual" or a
  "room").
  </p>
  @return the calendar user type or null if not set
  @see <a href="http://tools.ietf.org/html/rfc5545#page-16">RFC 5545
  p.16</a>