mxcl/homebrew — pull request #11938 by docwhat (2012-04-29 07:00:28+00:00)
Title: hub: install completion into site-functions

`_hub` needs to be installed into `share/zsh/site-functions`
not `share/zsh/functions`.

Files in `share/zsh/functions` must not change unless zsh is
upgraded and zsh is restarted. `site-functions` can change during a zsh
process's lifetime.