code: public static <K,V> MapFactory<K,V> tree(Comparator<K> comp) {
  	return new TreeMapFactory<K,V>(comp);
      }
docs: Returns a map factory that generates <code>TreeMap</code>s.
  <code>TreeMap</code>s are great for applications that use many
  small maps.
  
  @param comp Comparator used internally by the generated
  <code>TreeMap</code>s.