Bypass sha1sum/sha1 aliases. Fixes #640.
Bypass sha1sum/sha1 aliases. Fixes #640.

domenicosolazzo/nvm,vinaykaradia/clone-nvm,Kuzirashi/nvm,cirosantilli/nvm,tlevine/nvm,kumaria/nvm,pmq20/nvm,JasonChrYoung/nvm,creationix/nvm,cjac/nvm,pmq20/nvm,ljharb/nvm,PeterDaveHello/nvm,psychoss/nvm,joneit/nvm,christophercaburog/nvm,icyflame/nvm,michael-ni/nvm,vinaykaradia/clone-nvm,JanChw/nvm,psychoss/nvm,Theodeus/nvm,jbergstroem/nvm,Ingelheim/nvm,diegofcb10/nvm,creationix/nvm,Kuzirashi/nvm,parasaro92/nvm,LeeLovCY/nvm,modulexcite/nvm,elrasguno/nvm,SampleLiao/nvm,wskplho/nvm,michael-ni/nvm,jaawerth/nvm,greyhwndz/nvm,gtdeng/nvm,tianzhihen/nvm,WY08271/nvm,thomasf/nvm,bbuck/nvm,hkdobrev/nvm,dfackler/nvm,CristianCantoro/nvm,nontage24/nvm,chinazhaghai/nvm,wskplho/nvm,JanChw/nvm,wahyutaufik/nvm,jbergstroem/nvm,joneit/nvm,kmctown/nvm,Salahudeen/nvm,gtdeng/nvm,bbuck/nvm,mmorejon/nvm,devedbox/nvm,cnpm/nvm,youleiy/nvm,hanhailong/nvm,wahyutaufik/nvm,owen-it/nvm,slariviere/nvm,misterdjules/nvm,nontage24/nvm,chinazhaghai/nvm,fnogatz/swivm,diegofcb10/nvm,scq000/nvm,Ingelheim/nvm,mmorejon/nvm,reybango/nvm,reybango/nvm,PeterDaveHello/nvm,Richardphp/nvm,dfackler/nvm,evocateur/nvm,DigitallySeamless/nvm,parasaro92/nvm,cnpm/nvm,ljharb/nvm,jhliberty/nvm,tianzhihen/nvm,lukechilds/nvm,kmctown/nvm,PeterDaveHelloKitchen/nvm,woss/nvm,Salahudeen/nvm,edwmurph/nvm,scq000/nvm,Theodeus/nvm,cjac/nvm,PeterDaveHelloKitchen/nvm,jhliberty/nvm,hkdobrev/nvm,owen-it/nvm,cirosantilli/nvm,thomasf/nvm,modulexcite/nvm,DigitallySeamless/nvm,domenicosolazzo/nvm,kumaria/nvm,woss/nvm,edwmurph/nvm,misterdjules/nvm,IonicaBizauKitchen/nvm,mirydz/nvm,JasonChrYoung/nvm,williamboman/nvm,youleiy/nvm,bevacqua/nvm,WY08271/nvm,IonicaBizauKitchen/nvm,LeeLovCY/nvm,egilkh/nvm,evocateur/nvm,elrasguno/nvm,slariviere/nvm,CristianCantoro/nvm,greyhwndz/nvm,christophercaburog/nvm,williamboman/nvm,jaawerth/nvm,SampleLiao/nvm,hanhailong/nvm,egilkh/nvm,mirydz/nvm,devedbox/nvm,bevacqua/nvm,lukechilds/nvm,icyflame/nvm,tlevine/nvm,Richardphp/nvm