message: CM: Set zoomMin and zoomMax for Mapbox
diff: @@ -417,7 +417,7 @@ class MapBoxProvider extends ImageryProvider {
  constructor(mapType: MapType) {
  super(mapType);
  - this._zoomMin = this._zoomMax = 0;
  + this._zoomMin = 1; this._zoomMax = 20;
  switch (mapType) {
  case MapType.Street:
  this._baseUrl = "http://api.mapbox.com/v4/mapbox.streets/";
  