code: public TimezoneName addTimezoneName(String timezoneName) {
  		TimezoneName prop = new TimezoneName(timezoneName);
  		addTimezoneName(prop);
  		return prop;
  	}
docs: Adds a traditional, non-standard name for the timezone observance.
  @param timezoneName the timezone observance name (e.g. "EST")
  @return the property that was created
  @see <a href="http://tools.ietf.org/html/rfc5545#page-103">RFC 5545
  p.103-4</a>
  @see <a href="http://tools.ietf.org/html/rfc2445#page-98">RFC 2445
  p.98-9</a>