git_python: add utils.pop_key to __init__.py
git_python: add utils.pop_key to __init__.py

This keeps the interface consistent by importing
utils.pop_key into the git_python namespace.

Signed-off-by: David Aguilar <9de348c050f7cd1ca590883733c4e531ce610bf4@gmail.com>

pengshp/GitPython,bwrsandman/GitPython,Conjuro/GitPython,avinassh/GitPython,StyXman/GitPython,hvnsweeting/GitPython,jeblair/GitPython,dpursehouse/GitPython,beni55/GitPython,ghtdak/GitPython,cdht/GitPython,Conjuro/GitPython,dpursehouse/GitPython,pengshp/GitPython,zsjohny/GitPython,breavo/GitPython,avinassh/GitPython,gitpython-developers/GitPython,h4ck3rm1k3/GitPython,manasdk/GitPython,breavo/GitPython,bwrsandman/GitPython,cool-RR/GitPython,cool-RR/GitPython,Conjuro/GitPython,OpenInkpot-archive/iplinux-python-git,cool-RR/GitPython,zsjohny/GitPython,expobrain/GitPython,hvnsweeting/GitPython,gitpython-developers/gitpython,beni55/GitPython,gitpython-developers/GitPython,roidelapluie/GitPython,expobrain/GitPython,zsjohny/GitPython,nvie/GitPython,ghtdak/GitPython,avinassh/GitPython,h4ck3rm1k3/GitPython,nvie/GitPython,cdht/GitPython,cdht/GitPython,jeblair/GitPython,StyXman/GitPython,pengshp/GitPython,manasdk/GitPython,StyXman/GitPython,roidelapluie/GitPython,bwrsandman/GitPython,gitpython-developers/gitpython