code: public static String getPackageName(Elements elementUtils, Element element) {
  		return elementUtils.getPackageOf(element).getQualifiedName().toString();
  	}
docs: Returns the package name of the given element.
  NB: This method requires the given element has the kind of {@link ElementKind#CLASS}.
  @param elementUtils
  @param element
  @return the package name
  @author vvakame