CSP algorithm for feature extraction and decoding

Hi Guys!

Congratulation for release 0.6, I'm looking forward to seeing more decoding stuff in 0.7!
I committed my code about the CSP algorithm which is a supervised decomposition method for band pass filtered signals. It can be implemented like ICA or PCA from which I inspired to create the csp.py code. The only difference is that CSP needs epochs from 2 different conditions to be fitted.
What kind of functions would you like to include it in the decoding package of MNE?
It can be developed quickly, the main algorithm is already in csp.py
Cheers,

Romain