Remove deprecated 'mode' parameter from sklearn.manifold.spectral_embedding
Remove deprecated 'class_weight' parameter from RidgeClassifierCV.fit
Remove deprecated 'precompute_gram' parameter
Remove deprecated 'copy_Gram', 'copy_Xy' and 'copy_X' parameters
Remove deprecated 'Gram' and 'Xy' parameters from OrthogonalMatchingPursuit.fit
Removed 'Gram' and 'Xy' parameters were still in test_omp.py
Remove deprecated 'score_func' and 'loss_func' parameters from sklearn.metrics.scorer.check_scoring. Amend the code in all the other places they were used.
Remove 'copy_X', 'copy_Gram' and 'copy_Xy' documentation since these parameters have been removed
Merge pull request #3411 from lesteve/scheduled-removal-from-0.15

[MRG] Remove deprecated parameters whose removal was scheduled for 0.15
MAINT faster test_weight_boosting
TST speedup test_spectral_biclustering
TST faster check_transformer_pickle by fixing n_iter
TST speedup test_permutation_score

Also remove a warning with fbeta score that had non enought samples of
a specific class by chance.
TST remove joblib tests from sklearn
Tidy up by removing unnecessary local variables
Merge pull request #3414 from lesteve/scheduled-removal-from-0.15

[MRG] Tackle remaining comments in #3411
Merge pull request #3403 from ogrisel/speedup-tests

[MRG] Make tests faster to run