Changed min_zoom to be a nonNegativeInteger, to accomodate zoom level 0.
Changed min_zoom to be a nonNegativeInteger, to accomodate zoom level 0.

JimCallahanOrlando/DistrictBuilder,JimCallahanOrlando/DistrictBuilder,JimCallahanOrlando/DistrictBuilder,JimCallahanOrlando/DistrictBuilder