Thanks for packaging.

1. there are a few scripts that don't need the bash-shebang line;
   `checkbashisms' don't report any:
	- /usr/bin/git-effort
	- /usr/bin/git-pull-request
   or can be very easily be unbashified

2. the scripts can be improved; mainly, using shell builtins instead of
   forking external applications; see attached patch proposals; I'm prepared
   to put in some more effort into it, if you're interested

3. there would be nice if zsh-completion was also provided; there are some
   efforts to do so; see:
https://github.com/visionmedia/git-extras/issues/70
https://github.com/robbyrussell/oh-my-zsh
https://github.com/tlvince/git-extras/blob/zsh-completion/etc/zsh_completion.zsh