code: function LocationIQGeocoder(httpAdapter, apiKey) {
  
    LocationIQGeocoder.super_.call(this, httpAdapter);
  
    if (!apiKey || apiKey == 'undefined') {
      throw new Error('LocationIQGeocoder needs an apiKey');
    }
  
    this.apiKey = querystring.unescape(apiKey);
  }
docs: Constructor
  
  Geocoder for LocationIQ
  http://locationiq.org/#docs
  
  @param {[type]} httpAdapter [description]
  @param {String} apiKey      [description]