Improve City, Postal Town and Neightbourhood logic

[Snuffy2]

Based on the OpenStreetMap wiki on the different steps of the place key: https://wiki.openstreetmap.org/wiki/Key:place

Finds the first of these OSM place keys that is set to use for the places city attribute:
city, town, village, township, hamlet, city_district, municipality

Then finds the first of these OSM place keys that is set below the one used for city to use for the places postal_town attribute:
city, town, village, township, hamlet, borough, suburb

Then finds the first of these OSM place keys that is set below the one used for postal_town to use for the places neighbourhood attribute:
village, township, hamlet, borough, suburb, quarter, neighbourhood

Fixes #282