use git options instead of cd in install script
use git options instead of cd in install script

lukechilds/nvm,PeterDaveHello/nvm,creationix/nvm,evocateur/nvm,PeterDaveHelloKitchen/nvm,creationix/nvm,edwmurph/nvm,evocateur/nvm,ljharb/nvm,lukechilds/nvm,PeterDaveHello/nvm,edwmurph/nvm,ljharb/nvm,PeterDaveHelloKitchen/nvm