DOC reference and rename cross decomposition module
ENH: add failing test exposing bug in RandomizedPCA
FIX: only center if copy == True
ENH: get it right.
FIX: inverse_transform; tests
DOC better doc message
API: get rid of **params in PCA estimators.
DOC: more doc string fixes in pca.py
DOC: more fixes in pca.py doc strings
STY: get rid of unnecessary identifiers
FIX: X.copy() test now works
STY: removing unnecessay import
COSMITS
COSMIT: typo in examples/imputation.py
BUG: fix Py 3
Sample compiler config for windows
Force stdc++ link for the windows build
Regenerate pairwise_fast.pyx with recent cython for windows build

Previous versions of cython had a bad support for atomics under windows
Fix atomics definitions under windows for sklearn._hmm.pyx
typo