GMaps.geolocatesupports 4 functions:
                                            
- 
                                                    success(required): fires when geolocation has been successful
- 
                                                    error(required): fires when geolocation has not been done
- 
                                                    not_supported(required): fires when geolocation is not supported by the browser
- 
                                                    always(optional): fires always after every scenario described above.