code: function registerDriver(Driver, name, options) {
    if (this.drivers[name]) {
      log.error(new Error('Driver "' + name + '" is already registered.'));
      return;
    }
    if (!Driver || !Driver.prototype || typeof Driver.prototype.send !== 'function') {
      log.error(new Error('Driver "' + name + '" should implement "send" method.'));
      return;
    }
    this.drivers[name] = new Driver(options || {});
  }
docs: Registers output driver
  @param {Function} Driver Damson driver constructor
  @param {string} name Damson driver name
  @param {object} options Damson driver options