New formula 'nodebrew'

I fixed the issues on https://github.com/Homebrew/homebrew/pull/29729 .

* We can't create folders in $HOME from install like this.
* Can't assume /usr/local, use #{HOMEBREW_PERFIX}
* Can upstream make a change to their software to create this folders if they don't exist, so Homebrew doesn't have to pre-create them?
* brew audit nodebrew