code: function registerMethodClass(names, classConstructor) {
          for (var n = 0; n < names.length; ++n) {
              OAuth.SignatureMethod.REGISTERED[names[n]] = classConstructor;
          }
      }
docs: Subsequently, the given constructor will be used for the named methods.
  The constructor will be called with no parameters.
  The resulting object should usually implement getSignature(baseString).
  You can easily define such a constructor by calling makeSubclass, below.