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