Add getNode and replaceNote methods, refactor caches
Add getNode and replaceNote methods, refactor caches

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