ENH: Speed up sparse_coordinate descent
Fix silhouette score n_labels

Fix such that silhouette score raises error
when n_labels is incorrect
Added number of labels for debug and regexp in test
Replaced cython calls for dot operations with BLAS calls
Fix typo in linear_model documentation
Merge pull request #2960 from ethanwhite/docs-typo

Fix typo in linear_model documentation
Speed up using typed memory views
Merge pull request #2951 from Manoj-Kumar-S/speed_sparse

[MRG] Attempt to speed up cd_fast.
staged_predict predicts classes, not probabilites
Merge pull request #2964 from abhishekkrthakur/patch-1

staged_predict predicts classes, not probabilites
Added _LearntSelectorMixin in BaseGradientBoosting
TEST: fix test_forest:test_boston (#2965)
typo
Merge pull request #2971 from jyu-rmn/master

typo
DOC: the search for a split does not until one valid partition is found
add datarobot testimonial

use png -- thanks @larsmans
Merge pull request #2973 from pprett/datarobot-testimonial

add datarobot testimonial
DOC/MAINT: clarify cblas/README.txt
Added extra check to feature importances
Merge pull request #2966 from maheshakya/feature_selector

[MRG] Added _LearntSelectorMixin in BaseGradientBoosting