TST: relax warning class checked in lars
TST: lars tests: more brutal ill-conditionning
ENH: make CD Lasso raise ConvergenceWarning
Merge pull request #3030 from ogrisel/fix-lars-drop-for-good-test-failure

Fix LARS drop for good test failure
DOC: clear up the big elastic net confusion (I hope)

Several users have asked for LogReg w/ E-net (e.g. #3023). Did some
additional copyediting.
Merge pull request #3025 from ogrisel/remove-unstable-lobpcg-test

[MRG] Remove redundant yet unstable test_spectral_lobpcg_mode
ENH: stable test + catch warning + pep8
ENH: more robust test_toy_bayesian_ridge_object
ENH: configure travis to also test old numpy & scipy
DOC: add some header doc to the travis scripts
More informative numerical error message in SGD

Also add a test.
cosmit
DOC: Fixed roc_curve docstring

It does not make sense for y_score of roc_curve to be binary.
Merge pull request #3035 from ogrisel/test-sgd-stability-error

[MRG+1] More informative numerical error message in SGD
Merge pull request #3022 from ogrisel/travis-old-numpy-scipy

[MRG] Set travis to test old versions of numpy and scipy too
MAINT remove _label attribute from SVC.

Fixes #1573.
FIX numerical stability issues on 32 bit platform

The gini index and the mean square error (variance) might differ due
to numerical instability. Since those instabilities mainly occurs at
high tree depth, we restrict the maximal depth.
MAINT lazily import scipy.cluster

Prevents PIL from being dragged along. Fixes #2961.
ENH micro-optimize a few tests
ENH micro-optimize fast MCD

Tests run 10-20% faster, which is what I was aiming for (it takes
almost 5s on my box).