Add SK53_bulk:load to discarded tags

Added as per consultation with SK53. This tag served a similar purpose to tiger:upload_uuid

See also https://github.com/systemed/iD/pull/1615
Add addr:city to buildingAddress inputSet

as per trac ticket 5034
Correct name property
Localisation updates from https://translatewiki.net.
Localisation updates from https://translatewiki.net.
Localisation updates from https://translatewiki.net.
Add support for natural POIs: Trees and Peaks.

Since there are currently +3M trees and +1M peaks in the OSM DB,
it's about time these are supported as nice icons and directly create-able in Potlatch2.

Icons have been derived from the Maki icon set (https://github.com/mapbox/maki)
natural_tree.n.24.png is copied from park2-24.png
natural_peak.n.24.png is from triangle-24.png
 (with the colour changed to that of the peak symbol in the standard mapnik rendering)
The n.16 versions are simply scaled down versions of the n.24 images.
Merge pull request #109 from rnorris/master

Add support for natural POIs: Trees and Peaks.
Merge pull request #107 from EdLoach/mapfeatures

Add addr:city to buildingAddress inputSet
Merge pull request #104 from pnorman/patch-1

Add SK53_bulk:load to discarded tags
Improve way improving
Further improvements above this improvement to improving are possible
Fix user-selected imagery
P2 is like crystal, it breaks easy
Memorise tag combinations
(have been meaning to do this for ages...)