code: @Factory
      public static ParameterRequestMatcher requestParameter(final String paramName, 
              final Matcher<? super List<String>> pred) {
          return new ParameterRequestMatcher(pred, paramName);
      }
docs: Factory method to create new instance of this matcher.
  @param paramName name of a request parameter
  @param pred a predicate to be applied on the request parameter
  @return new instance of this matcher