FIX: random_start feature in GaussianProcess
FIX: gp_diabetes_dataset examples (theta_ attribute)
ENH Sparse multilabel target support

All multilabel metric calculation is now performed efficiently over
sparse CSR matrices.
DOC label indicators are clearer as ints than floats
DOC more precise input type for multilabel metrics
FIX Using random_state.rand rather than scipy.rand consistently in Gaussian Process
TST regression test for optimum over several random-starts of GP
Merge branch 'pr/3545'

Fixes #3545.
DOC:Typo in doc

Fixes #3553
DOC GP fixes in what's new
Merge branch 'pr/3395'
DOC correct default value
FIX set vectorizer vocabulary outside of init
Deprecate vectorizer fixed_vocabulary attribute
DOC add missing details to what's new
MAINT simplify covertype benchmark