Configurable chunk size

[bpiotr]

Fixes#648

[Byron]

Thanks a lot! I am loving the tests, too!

I would happily merge it, it’s just flake8 having some silly white-space issue: https://travis-ci.org/gitpython-developers/GitPython/jobs/282786566#L1047 .

[alexandernst]

This is still not merged because of a single whitespace at the end of line 647. @bpiotr can you fix it or give me push permissions to your repo so I can push the fix there?

[codecov-io]

Codecov Report

Merging #681 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #681 +/- ##
==========================================
+ Coverage 94.67% 94.67% +<.01% 
==========================================
Files 59 59 Lines 9310 9322 +12 ==========================================
+ Hits 8814 8826 +12 
Misses 496 496

Impacted Files	Coverage Δ
git/test/test_repo.py	97.87% <100%> (+0.04%)	⬆️
git/cmd.py	83.62% <100%> (ø)	⬆️

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[bpiotr]

@alexandernst OK, it's fixed now.

[alexandernst]

@Byron can we merge this and make a release?

[Byron]

Thanks a ton for your contribution! There is another PR in review (#755), and when done, a new release can be cut.