git completion using gitfast oh-my-zsh plugin

[journalbits]

I'd love it if hub's git completion would work nicely with the git completion setup by the gitfast plugin that comes with oh-my-zsh, see https://github.com/robbyrussell/oh-my-zsh/tree/master/plugins/gitfast.

[mislav]

Ah, I see. Gitfast defines its own _git completion. It's probably incompatible with hub zsh completion which is designed to wrap _git completion that ships with zsh (or git itself).

It might take a bit of work to make ours compatible with gitfast. Takers welcome