Implement sequence step forward/backward
Implement sequence step forward/backward

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