Object oriented version with text visualization

[ocarneiro]

I started out trying to detach objects to create an API as suggested in the project vision, but it grew a little bigger.

I've managed to create a few classes and a few unit tests. And then I realized the world object could be used with different ways of rendering, so I tried it out.

I'm on my way into evolving that even further, but I thought I should reach for a pull request so that my code doesn't go too far from here as it would become impossible to merge.

I also managed to make it Python 2 and 3 compatible. I messed up my PEP8 efforts, but they will come back in future commits.

[ocarneiro]

Sorry it can't be automatically merged... I tried to keep this version as close as I could from the original repo. If you test and look at the code, you may feel safe to accept it all as it is.

[fogleman]

Nice work.

Instead of merging, I think it is best for the fork to remain separate. There is some value in the original project as it is < 1000 lines and more approachable by people who want to learn. Yours can be further developed to have more features and be more API-like.

[ocarneiro]

Thanks for the feedback!

I'll keep working on it as an independent repo, then.