This reverts commit 39e2545. Conflicts: CHANGELOG.md
It seems a little bit paranoid to assume there might be a newline or tab in a file name, but it's perfectly valid on many systems. When such a character exists in a filename, `git ls-files` will return something like `"file\nname"` in its listing, which is problematic because the calling code expects neither the escaped whitespace nor the quotes. By passing the `-z` argument, git uses the null character as the sep- arator, never escaping whitespace nor quoting file names. Additionally, I found I had to use the "\x0" syntax to represent the null character because "\0" is ambiguous in the context of for instance `String#sub`.