Handle indented comments in git config files

[tmzullinger]

It's perfectly valid for a git config file to contain comments inside
sections, e.g.:

[core]
        # This is a shared repository
        sharedRepository = true

The git tools all parse this fine while GitPython was choking on it.

[tmzullinger]

Fixed in tmzullinger@6925345 (pull request sent).

[Byron]

Why did you reopen it ?

[tmzullinger]

I have no idea how that happened. It wasn't intentional or anything I did, that I can recall. Sorry for the trouble, thanks for merging the fixes.