code: public Auth authorizer(final String name, final String pattern,
        final Authorizer<?> authorizer) {
      authorizer(authorizer, name, pattern);
      return this;
    }
docs: Protect one or more urls with an {@link Authorizer}. For example:
  
  <pre>
  {
  use(new Auth()
  .form("*")
  .authorizer("admin", "/admin/**", new RequireAnyRoleAuthorizer("admin"))
  );
  }
  </pre>
  
  <p>
  Previous example will protect any url with form authentication and require and admin role for
  <code>/admin/</code> or subpath of it.
  </p>
  <p>
  NOTE: make sure url is protected by one pac4j client.
  </p>
  
  @param name Authorizer name.
  @param pattern URL pattern to protected.
  @param authorizer Authorizer to apply.
  @return This module.