Use default order for coordinates

To match with services like [Google Maps](https://developers.google.com/maps/documentation/javascript/reference#LatLng) and [Mapbox](https://www.mapbox.com/mapbox-gl-js/api/#new-mapboxgl-latlng-latitude-longitude-), I've flipped latitude and longitude.

* westsouth => southwest, eastnorth => northeast
* LngLat => LatLng