Changed PCA definitions to match course awa the outputs to get the eigenvalues
Added comment about how to get eig..
PCA and Kmeans
Prepping data

Script to apply Z-score to data and then apply each mask and store
resulting matrices in separate .nyp files.
BH - PCA: visualize things

...use nbviewer...
Merge pull request #46 from imanehaf/master

Imane modifications