Covering all cases
- external commands as executables
- external commands as Ruby libraries
- built-in command verbs
This is intended as a development aid.
A side benefit is that an external command can be constructed
to use a `run` method, rather than having to accomplish everything
at `require` time.
Full paths to subcommand source and Ruby may be given,
which is helpful in troubleshooting, particularly for
forcing a specific Ruby version.
Example usage:
```bash
$ HOMEBREW_BREW_FILE=/usr/local/bin/brew /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby /usr/local/Library/brew.rb /usr/local/bin/brew-cask.rb help
```
Previously, this would work, but throw an odd error when
returning to Homebrew. Fix: we unconditionally do not
return to Homebrew.
global replace of:
'phinze/homebrew-cask' -> 'caskroom/homebrew-cask'
'phinze/cask' -> 'caskroom/cask'
'phinze/homebrew-testcasks' -> 'caskroom/homebrew-testcasks'
and various other specific places that needed updates
<3 the homebrew-cask community!
Roland Walker