whereNear method
Returns an objects with key point values near the point given
Implementation
void whereNear(String column, ParseGeoPoint point) {
final double latitude = point.latitude;
final double longitude = point.longitude;
queries.add(MapEntry<String, dynamic>(_singleQuery,
'"$column":{"\$nearSphere":{"__type":"GeoPoint","latitude":$latitude,"longitude":$longitude}}'));
}