Merge pull request #3412 from brentp/logistic_l1_l2_ex

[MRG] use more interesting range for C in logistic l1 l2 example.
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
DOC improve documentatino thanks to @vene and remove mention of relevant labels
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
Merge branch 'master' into theilsen

Conflicts:
	doc/modules/linear_model.rst
ENH add sample_weight support to dummy classifier
ENH don't convert dataframes in grid search and cross-validation
Merge pull request #3418 from arjoly/dummy-weight

[MRG] ENH add sample_weight support to dummy classifier
DOC update what's new
DOC sample_weight attribute
Fix for old Numpy 1.6.3
Added to comments to better explain last commit
FIX: Remove raw_coef_ attribute that eats up memory