OSM Page: http://wiki.openstreetmap.org/wiki/Tag:natural%3Dcliff
note that "the top of the cliff should be on the left side of the way, and the bottom on the right side".
TO DOne: Need to check LINZ georeferencing direction.
check done ---> it is opposite. need to use same trick as lake_poly to export the ways in reverse order.
HB uploaded for the Akl Isl and Bounty Isl 16 Aug 2012.
HB 18 Aug 2012: re-tagging approved for all areas by Glen, seconded by me.
HB 19 Aug 2012: uplaoded for the antipodes in changeset 12779352