Style fixes
[DOC] missing parameter description
MAINT Set random_state, modernize tests
TST max_features for more tree estimators
TST remove unused tests
ENH add missing pxd of utis.random
ENH Use file configuration
FIX signature
cosmetic: Changed all instances of nonlinear to non-linear
Merge pull request #2187 from FedericoV/non_negative_style

cosmetic: Changed all instances of nonlinear to non-linear
FIX faulty import in 20news docs
make new classes for lasso_path/enet_path and deprecate old
ENH : massive refactoring of CV models in coordinate descent. Now the algo core is in path functions
update what's new