fix zsh completion
This `_hub` completion script should correctly wrap modern versions of the `_git` scripts distributed by both zsh (native) and git (bash-based). The bash-based version could use a bit more love to complete arguments to the actual subcommands. Right now it can only complete the names of the subcommands themselves. The `compdef` that was previously emitted by `hub alias -s` prevents the new `_git` script from working, so it has been eliminated. Fixes #231
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