Use curl or wget, whichever is available
Use curl or wget, whichever is available

Also spit out an error message if we have neither.
reybango/nvm,hanhailong/nvm,misterdjules/nvm,lukechilds/nvm,LeeLovCY/nvm,JanChw/nvm,parasaro92/nvm,diegofcb10/nvm,edwmurph/nvm,sjfkai/nvm,devedbox/nvm,thomasf/nvm,wahyutaufik/nvm,williamboman/nvm,ljharb/nvm,youleiy/nvm,jbergstroem/nvm,jbergstroem/nvm,tianzhihen/nvm,kumaria/nvm,vinaykaradia/clone-nvm,vinaykaradia/clone-nvm,michael-ni/nvm,SampleLiao/nvm,reybango/nvm,Kuzirashi/nvm,bbuck/nvm,Salahudeen/nvm,Richardphp/nvm,slariviere/nvm,youleiy/nvm,kmctown/nvm,dfackler/nvm,devedbox/nvm,xtuple/nvm,modulexcite/nvm,bbuck/nvm,SampleLiao/nvm,cjac/nvm,cnpm/nvm,domenicosolazzo/nvm,Richardphp/nvm,LeeLovCY/nvm,scq000/nvm,IonicaBizauKitchen/nvm,tlevine/nvm,greyhwndz/nvm,greyhwndz/nvm,gtdeng/nvm,nontage24/nvm,hkdobrev/nvm,elrasguno/nvm,hkdobrev/nvm,dfackler/nvm,mirydz/nvm,jhliberty/nvm,misterdjules/nvm,egilkh/nvm,christophercaburog/nvm,scq000/nvm,WY08271/nvm,PeterDaveHello/nvm,CristianCantoro/nvm,Salahudeen/nvm,cirosantilli/nvm,kumaria/nvm,cjac/nvm,ljharb/nvm,wskplho/nvm,owen-it/nvm,kmctown/nvm,wahyutaufik/nvm,chinazhaghai/nvm,icyflame/nvm,lukechilds/nvm,cnpm/nvm,bevacqua/nvm,joneit/nvm,christophercaburog/nvm,wskplho/nvm,evocateur/nvm,Kuzirashi/nvm,WY08271/nvm,NicCollins/nvm,joneit/nvm,PeterDaveHello/nvm,hanhailong/nvm,psychoss/nvm,JanChw/nvm,woss/nvm,Ingelheim/nvm,mirydz/nvm,JasonChrYoung/nvm,IonicaBizauKitchen/nvm,nontage24/nvm,Theodeus/nvm,slariviere/nvm,DigitallySeamless/nvm,egilkh/nvm,DigitallySeamless/nvm,cirosantilli/nvm,CristianCantoro/nvm,modulexcite/nvm,michael-ni/nvm,Ingelheim/nvm,psychoss/nvm,thomasf/nvm,PeterDaveHelloKitchen/nvm,williamboman/nvm,parasaro92/nvm,elrasguno/nvm,Theodeus/nvm,JasonChrYoung/nvm,pmq20/nvm,mmorejon/nvm,diegofcb10/nvm,chinazhaghai/nvm,icyflame/nvm,creationix/nvm,creationix/nvm,tlevine/nvm,edwmurph/nvm,evocateur/nvm,jhliberty/nvm,PeterDaveHelloKitchen/nvm,tianzhihen/nvm,jaawerth/nvm,fnogatz/swivm,appleboy/nvm,pmq20/nvm,domenicosolazzo/nvm,bevacqua/nvm,owen-it/nvm,mmorejon/nvm,jaawerth/nvm,gtdeng/nvm,woss/nvm