Fix the recursive bug when .git is in the root dir, and add git check…

[iNoSec2]

…out . at the end to have a cloned repo instead of having just a .git repo

[gehaxelt]

Hi,
as this tool is only for downloading the repo, I don't think adding cd $BASEDIR && git checkout is useful here, since a checkout might fail due to missing files and the cd changes the current working directory, which might be unexpected.