intoduce setup.py

[Titotix]

Create an importable module for peepdf with setuptools
So we can use easily peepdf as a lib, and somehow fix the pointed issue by #50. (ImportException raised if we don't launch our script from peepdf repo.)
I think this PR and #50 should be both merge, although this one will fix the issue of #50 while running python setup.py install/python setup.py develop.
btw, do you think about uploading your project to pypi ?

[Titotix]

This PR is not fully working ! :/
The setup.py script here only install the included dependencies (colorama, aespython, jsbeautifier). So it is definitely wrong.

To properly create a module it needs to create a repo (let's say peepdf/ ) and to putt all code inside it. Then to adapt all import in the code.
@jesparza : Do you agree on this ? Thoughts anyway ?

[Titotix]

For ease of use, I needed this modification anyway, so I did it.
See https://github.com/Titotix/peepdf/tree/setupv4
If you would like a PR for it, I would be happy to do so.