listIssues(options, cb) {
      return this._requestAllPages(`/repos/${this.__repository}/issues`, options, cb);
   }
List the issues for the repository
@see https://developer.github.com/v3/issues/#list-issues-for-a-repository
@param {Object} options - filtering options
@param {Requestable.callback} [cb] - will receive the array of issues
@return {Promise} - the promise for the http request