Version

The structure of the script completely changed. Now, the nsga2 method
can be installed as an python library using setuptools.
Revert "Version"

This reverts commit 4cf57c1ce97c594a26025e8b7e6885617f36f174.
Version 2.0

The structure of script completely changed to create a Python module.
Now, the NSGA-II python can be installed as a library.