Improve npm build commands, add shx for windows
Improve npm build commands, add shx for windows

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