refactored _ tests, all pass still
refactored _ tests, all pass still

LoicMahieu/yargs,jean-emmanuel/yargs,substack/node-optimist,ChristianMurphy/yargs,yargs/yargs,ammeep/yargs,Teino1978-Corp/Teino1978-Corp-node-optimist,ggoodman/yargs,sgentle/yargs,tepez/yargs,raine/yargs,rstacruz/yargs,geophree/yargs,zkat/yargs,bcoe/yargs,elas7/yargs,etiktin/yargs,nexdrew/yargs,nexdrew/yargs,oti/yargs,jvdm/yargs,yargs/yargs,geophree/yargs,dkoleary88/yargs,ammeep/yargs,bcoe/yargs,elas7/yargs,yargs/yargs,jean-emmanuel/yargs,dkoleary88/yargs,tepez/yargs