TYPO fix
FIX for iid weighting in grid-search
DOC FIX finite precision
typo
Clarify docstring in lars_path
BUG SGDClassifier and friends did not forget labels_ in re-fit

Fixes #1703.
ENH optimizations in sklearn.cross_validation
DOC clarify C parameter on LogisticRegression
TST + DOC + COSMIT refactor ParameterGrid and test it
ENH len on ParameterGrid and ParameterSampler
BUG deprecation of grid_scores_ in GridSearchCV

The test still used the old name; the deprecation warning
referred to the wrong attribute name.
BUG always do cross-validation in GridSearchCV

Optimization for special case of one point in the grid caused cross
validation to be skipped entirely. Fixes #1782.
DOC fix clone and get_params documentation
TST grid search/randomized search on non-BaseEstimator

See #1265.
TST actual sparse input in sparse k-NN tests
COSMIT prevent a copy in randomized LR

Also remove some superseded Py3 compat code.
TST speed up comment tests by ~20%

See #339.
TST radius-neighbors regression test not entirely stable
BUG additive_chi2 missing in KERNEL_PARAMS

Also made the definition more readable and introduced frozen sets.
BUG + DOC fix Nystroem for other kernels than RBF

Fixes #1785, #1786.