Windows fixes

I fixed paths on tests file, so I could properly run them in my Windows machine.
Also, replaced hardcoded `/` with `path.sep`.

For the commit messages, I found you were using some style between 791ad058137b8a1afdf288124e1649a10a8e209c...c1eff9b6d78bf57cbe8631a62d35a639ddd23b85, but other messages did not have this style, so I ignored him.