Merge pull request #599 from porjo/master

Use OSM Nominatim API for search
Unjoin -> Disconnect
SplitWay -> Split
ReverseWay -> Reverse
Entity#mergeTags
iD.actions.Join
Start iD.operations.Merge (#435)

It's currently limited to merging (joining) exactly two lines.

Fixes #370.
Add more translations, opacity to brightness YOU WIN @ansis
Fix MoveWay mode (fixes #602)
Added quatdrilateralize function (square corners)
Change name from quadrilateralize to orthogonalize to match SVG
Merge remote branch 'upstream/master'