Homebrew/homebrew — pull request #26555 by mistydemeo (2014-02-09 21:33:49+00:00)
Title: Recognize --head as an alias for --HEAD

Homebrew currently recognizes "--head" during the install process, but rather than actually fetch HEAD it just nags the user to use the correct option. Since we recognize the spelling anyway, this just promotes the lowercase version to an official alias.