K-Means visualization inspired by the Stanford Online Machine Learning course.
Uses SFML 2.0 RC.

You can change the number of clusters from 2 to 9 by pressing 2-9 on the keyboard-the next loop will show the algorithm with that many clusters.

Known Bugs:

--Sometimes the iteration gets stuck and doesn't recognise the stability of the clusters - probably something to do with floating-point precision.
--Occurs less now that we've updated to to SFML2 RC.