Compute vertex icons at all zooms (fixes #2249)
(before they got created without an icon if they enter() at zoom 16)
Add street lamp preset (fixes #2271)
Use the more common tagging for a tailor

shop=tailor outnumbers craft=tailor by about 2:1, so should be preferred
Delete relations that become empty (#2270)
Set vertex attributes on update selection not enter (re: 01ca07f)
Merge branch 'master' of github.com:openstreetmap/iD