[MRG+1] Add Brier_score_loss to model validation doc#6841

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moutai wants to merge 3 commits intoscikit-learn:masterfrom

moutai:brier_model_evaluation_docs

Commits on May 29, 2016

Add Brier_score_loss to model validation doc
moutai
committed

Commits on Jun 4, 2016

Add more precise explanation of the metric, add two references and fix typo in doctest result
moutai
committed

Commits on Jun 11, 2016

Remove mention of multi-class to match the supported implementation, fix references section and pep8 formatting
moutai
committed