[MRG] Fixed brier_score_loss function when y_true only has one label#8459

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jorkro wants to merge 1 commit intoscikit-learn:masterfrom

jorkro:jorrit/brier_score_fix

Commits on Feb 25, 2017

Fixed brier_score_loss function in the case where y_true only contains one label by not letting label_binarize convert 1s to 0s.
jorkro
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