[Tile-serving] [osm2pgsql] Add recommended types to columns for extra attributes (#275)

[Paul Norman]

See #168 for what made me notice.

We appear to be missing `osm_changeset`. I tested it along with `osm_version` for #271

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https://github.com/openstreetmap/osm2pgsql/pull/275#issuecomment-72706782
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