Add city_of_hampstead json
Add city_of_hampstead json

openaddresses/openaddresses,slibby/openaddresses,sergiyprotsiv/openaddresses,slibby/openaddresses,mmdolbow/openaddresses,openaddresses/openaddresses,sergiyprotsiv/openaddresses,mmdolbow/openaddresses,orangejulius/openaddresses,orangejulius/openaddresses,openaddresses/openaddresses,sergiyprotsiv/openaddresses,mmdolbow/openaddresses,orangejulius/openaddresses,slibby/openaddresses