Homebrew/homebrew — pull request #31242 by mikemcquaid (2014-07-30 11:34:14+00:00)
Title: outdated: allow passing formulae as arguments.

If formulae names are passed as arguments check if just they are outdated. Additionally, return a failed code if they are outdated.

This will hopefully be able to stop people complaining about the outdated error code as they can now just run e.g.:
`brew outdated git && brew upgrade git`