Add Mapillary Images, Mapillary Signs to imagery_used tag (closes #3069)
Add Mapillary Images, Mapillary Signs to imagery_used tag
(closes #3069)

mapmeld/iD,kartta-labs/iD,ngageoint/hootenanny-ui,openstreetmap/iD,mapmeld/iD,edpop/iD,openstreetmap/iD,bagage/iD,morray/iD,1ec5/iD,edpop/iD,kartta-labs/iD,bagage/iD,AndreasHae/iD,ngageoint/hootenanny-ui,1ec5/iD,kartta-labs/iD,digidem/iD,AndreasHae/iD,1ec5/iD,mapmeld/iD,openstreetmap/iD,AndreasHae/iD,bagage/iD,ngageoint/hootenanny-ui,edpop/iD,morray/iD,digidem/iD