code: public <P>JsonModelBuilder<T> add(JsonPropertyBuilderCreator<T>... creators) {
  		for (JsonPropertyBuilderCreator<T> creator : creators) {
  			addSub(creator.<P> get());
  		}
  		return this;
  	}
docs: Attaches property builder for the given types.
  @param creators
  @return this
  @author vvakame