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
COSMIT sphinx fixes
COSMIT pep8
Fix broken link to web designer
Fix broken link to web designer
Add fit_transform to FastICA.
Add inverse_transform to FastICA.
Add docstrings to methods in FastICA.
Address @dengemann's comments.
Add test.