Wrong ccount on Windows

[shortsnake]

On Windows the ccount is incorrectly calculated to be the number of commits from the beginning of the repository and to HEAD. This is due to the ^ character being a escape character in the command prompt shell on Windows (since shell=True is used to subprocess).

setuptools-git-versioning/setuptools_git_versioning.py

Line 86 in 14a4adc

res = _exec("git rev-list --count HEAD ^{name}".format(name=name))

By quoting the name argument to git everything works as expected: \"^{name}\"

[dolfinus]

Hi.

Thank you for a fix. I've applied it into master branch and released v1.2.10, please check.

[shortsnake]

Works correctly with both cmd and powershell on Windows now. Thanks.