FIX: AdditiveChi2Sample can be initialized with sample_interval, #3068
added tests for sparse matrix inputs to BaggingClassifier and BaggingRegressor
open iris files with  statement to avoid ResourceWarning
Add tests for the sample_interval in #3069
plot_adaboost_multiclass.py: handle case where boosting terminated early. Add missing author on other boosting examples.
xrange -> range
Merge pull request #3078 from ndawe/examples

[MRG] plot_adaboost_multiclass.py: handle case where boosting terminated early
Merge pull request #3074 from msalahi/iris-file-warnings

open iris files with 'with' statement to avoid ResourceWarning
FIX: typo in gen_rst.py
FIX: More robust test_extmath.py, compatible with older numpy
Fix the pep8 violations
TruncatedSVD: Calculate explained variance.

Fixes #3047
DOC: Remove dead link

Link to installation instructions was pointed to a non-existant
location.
ENH: Compute lower number of points by default

Each new point can be expensive to compute depending on model complexity; five
points is to see overall shape of the curve.
Improved the learning curve example.

Scaled y-axis to make it easier to compare the two methods.
Wrapped duplicate code into a utility function that users can copy, paste
and adapt in their own project.
Added more iterations to cross-validate the GaussianNB model to get a smoother
curve.
Fixed style errors detected by pep8.
Merge pull request #3069 from ssaeger/issue_3068

FIX: AdditiveChi2Sample can be initialized with sample_interval, #3068
updated authors
DOC: Change URL-based link to sphinx :ref:
Merge pull request #3085 from eickenberg/update_ridge_authors

Update authors in sklearn/linear_model/ridge.py