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downloaded the shp files from http://www.cbs.nl/nl-NL/menu/themas/dossiers/nederland-regionaal/publicaties/geografische-data/archief/2015/wijk-en-buurtkaart-2014-art.htm
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Worked on the command line with ogr2ogr*:
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ogr2ogr -f "ESRI Shapefile" source_maps/wgs84.shp source_maps/shape-2014-versie-1.0/gem_2014.shp -s_srs EPSG:28992 -t_srs EPSG:4326
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ogr2ogr -f "GeoJSON" -lco COORDINATE_PRECISION=6 source_maps/wgs84.geojson source_maps/wgs84.shp
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Simplified it to ~1% in mapshaper.org
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retrieved province data from http://www.cbs.nl/nl-NL/menu/methoden/classificaties/overzicht/gemeentelijke-indeling/2015/default.htm
- terminal commands taken from http://cobr.io/2015/03/how-to-build-a-chloropleth-map-with-leaflet-js-and-a-dash-of-d3-js/