fluid dynamics update.

The fluid dynamics is working now! albeit at a slow frame rate but it is actually working.

Python fluid dynamics library.

I'm currently working on a fluid dynamics library for my graphics library but have a very broad implementation up here. This is currently a work in progress. so it may or may not work. It requires fftw. I plan to use it to show the flow between nodes on a graph.

Original paper [JGT01]
Code here.