ENH : add reconstruction_err_ for NMF with sparse input
use scipy.linalg in test_nmf.py
adding comment on why sparse frobenius is ok as done
Merge pull request #1607 from agramfort/reconstruction_err_nmf_sparse

MRG : add reconstruction_err_ for NMF with sparse input
DOC: small fix in the regression's score method documentation
changed wording in linear model docs about Normalized. It was frustrating me haha
TST some more tests for multi output lars
BUG: reassignment_ratio == 0 in MiniBatchKmeans

And add an additonal test
Minor bug fix in metrics.adjusted_rand_score
Added tests
COSMIT translate lgamma replacement to C and clean it up
BUG: sparse center reassignment MiniBatchKMeans
BUG: sparse vs non sparse centers

The 'toarray()' method is not present on arrays
COSMIT add lgamma to gitattributes
Merge branch 'master' into example_gallery_cleanup