replacing stupid pathlib with path.py which is much more friendlier. 

Sorry about earlier misjudgement, but after looking at it for quite sometime, I think that pathlib just sucks and it's hard to get them to change things since they are now part of Python libs, you would have to do all sorts of PeP write up and stuff. Let's just use path.py: https://github.com/jaraco/path.py which is much friendlier and easier to use. Case in point, did you know that pathlib does not do `chdir()` ?!