[#5411] ticket:268 Added patched GitPython to the requirements
[#5411] ticket:282 Skip git submodules when computing trees
[#5411] Adjusted requirements for patched version of GitPython

Signed-off-by: Cory Johns <johnsca@geek.net>
[#5411] Reverted version bump to smmap as it isn't really used and gitdb only requires >= 0.8.0

Signed-off-by: Cory Johns <johnsca@geek.net>