Fix 403/404 errors from mapbox-gl trying to access levels that don't exist (#25)
Fix 403/404 errors from mapbox-gl trying to access levels that don't exist (#25)

* Fix 403/404 errors from mapbox-gl trying to access levels that don't exist by setting the maxzoom of the vector service.

* Set maxzoom to default for metadata that does not contain a maxzoom.

* Set default maxzoom to the default maximum Esri vector tile level.

Esri/esri-leaflet-vector-basemap-poc,Esri/esri-leaflet-vector-basemap-poc