FIX verbosity of the mds

Now, the verbose option doesn't need to be strictly equal to 2 to print out
the stress at each iteration.
MAINT: unreachable code removed from BernoulliNB

The deleted code was unreachable. The previous call to check_arrays
ensures that X and y have consistent first dimensions.
BUG SVMlight loader should check whether n_features is big enough

scipy.sparse won't complain when it gets a dimensionality that is
too large, causing crashes in estimators.

Fixes #1630.
MAINT: use stable blas getter API
BUG lower space complexity of estimate_bandwidth to linear

Previously quadratic, see #2613.
BUG: typo fixes in sklearn.mixture.gmm
Merge pull request #2614 from zyv/patch-1

BUG: typo fixes in sklearn.mixture.gmm
MAINT: fix broken links to numfocus.org on donations page.
Merge pull request #2615 from rgommers/fix-numfocus-link

MAINT: fix broken links to numfocus.org on donations page.
fix: pass warm_start to BaseSGDRegressor
fix: make Regressor test case extend CommonTest (move two clf specifc tests to clf test case)
DOC be more explicit on mean-shift scalability

Fixes #2613.
Merge pull request #2617 from pprett/sgd-regressor-fix

[MRG] pass warm_start to BaseSGDRegressor
FIX stop forcing deprecation warnings for external packages