LocationIQGeocoder = 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);
}
Constructor

Geocoder for LocationIQ
http://locationiq.org/#docs

@param {[type]} httpAdapter [description]
@param {String} apiKey      [description]