lesson 9 - add code example for EM with GMM

[bertdv]

see lesson 9. I think we shoudl download that Old Faithful data set and store in it ./files because Bishop has taken down his data set site

[marcocox]

Done. I have to say the final plot looks pretty darn good on nbviewer :-)

http://nbviewer.ipython.org/github/bertdv/AIP-5SSB0/blob/master/lessons/09_clustering_with_Gaussian_mixture_models/Clustering-with-Gaussian-Mixture-Models.ipynb

I chose to put the plotting code in a separate file, and all the interesting code in the notebook itself. If you think it's too much code, we could move it to a separate file. But I thinks it's nice to see what's going on.

Also, scripts/interactive_em_demo.jl contains an interactive (step by step) demo that you can run from the command line.

[bertdv]

awesome! thanks