DOC clarify order of output in NB predict_proba
Small documentation fix: from CMS to VCS
TST Gini is equivalent to mse in binary classification
Merge pull request #2743 from eltermann/doc_fix

Small documentation fix: from CMS to VCS
Merge pull request #2744 from arjoly/test-impurity

TST Gini is equivalent to mse in binary classification
FIX don't put data in source dir in bench_covtype

When running under a tool such as @fabianp's profiler yep,
dirname(__file__) is the location of the tool's __main__.py
instead of the benchmarks directory.

Also, we shipped a tarball containing a large dataset before.
Test primal-dual relationship in Ridge.
More robust test for sample_weight in Ridge.
Merge branch 'ranking_metrics' of https://github.com/mblondel/scikit-learn into ranking_metrics
Add Spearman's rho correlation score.
Add DCG and NDCG scores.