Working on setup.py

[sciencectn]

Hey all,

In case you're interested, I'm working on a setup.py over in my fork of the repository:

https://code.google.com/r/sciencectn-cgal-setup/

It's pretty awkward at the moment. Right now I'm trying to figure out a cross-platform way to check for dependencies since certain targets depend on them (like ImageIO and Eigen3). CMake is already really good at this but I have to figure out a way in Python.