code: function Jenkins(options, log) {
    var parsed = url.parse(options.url);
  
    if (options.username && options.password) {
      parsed['auth'] = util.format('%s:%s', options.username, options.password);
    }
  
    this._url = url.format(parsed);
    this._options = options;
    this.log = log || logmagic.local('jenkins');
  }
docs: Jenkins Client.
  @constructor
  @param {Object} options, including:
  url: Jenkins server URL
  username, password: Credentials
  delay: polling interval in milliseconds
  attempts: number of polling attempts to wait for builds to appear
  @param {Object} log Optional logging util