mxcl/homebrew — pull request #16961 by ToQoz (2013-01-09 02:31:28+00:00)
Title: git: Add installing git-completion.zsh

Script git-completion.zsh load git-completion.bash in same directory. https://github.com/git/git/blob/master/contrib/completion/git-completion.zsh#L25

But git-completion.bash is installed into bash_completion.d.
So I add installing git-completion.zsh into bash_completion.d same as git-completion.bash.