Add _cmd_setup_dirs for homebrew installation.
Add _cmd_setup_dirs for homebrew installation.

1000ch/nodebrew,hokaccha/nodebrew,1000ch/nodebrew,yosuke-furukawa/nodebrew,hokaccha/nodebrew,aycabta/nodebrew,yosuke-furukawa/nodebrew,yosuke-furukawa/nodebrew,hokaccha/nodebrew,aycabta/nodebrew