code: function WSTrustResponse(callContext, response, wstrustVersion) {
    this._log = new Logger('WSTrustResponse', callContext._logContext);
    this._callContext = callContext;
    this._response = response;
    this._dom = null;
    this._errorCode = null;
    this._faultMessage = null;
    this._tokenType = null;
    this._token = null;
    this._wstrustVersion = wstrustVersion;
  
    this._log.verbose(function(){return scrubRSTRLogMessage(response);});
  }
docs: Creates a new WSTrustResponse instance.
  @constructor
  @private
  @param {object} callContext Contains any context information that applies to the request.
  @param {string} response   A soap response from a WS-Trust request.
  @param {sting}  wstrustVersion The version for the WS-Trust request.