[MRG] Use fast pairwise distance calculations for metric='sqeuclidean'#12601

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rth wants to merge 2 commits intoscikit-learn:mainfrom

rth:fast-sqeuclidean

Commits on Nov 15, 2018

Use fast pairwise_distances for metric='sqeuclidean'
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Commits on Nov 16, 2018

Lint
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