Add scikit-learn-contrib/stability-selection and improve randomized_l1 transformers#308

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teabolt wants to merge 7 commits intoTeamHG-Memex:masterfrom teabolt:sklearn-contrib-stability-selection

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Commits on Apr 28, 2019

Accept StabilitySelection for the _select_names feature name transformer (if scikit-learn-contrib/stability-selection available)
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Conditionally test transform_feature_names on randomized_l1 (scikit-learn) and stability_selection (scikit-learn-contrib)
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Mention stability selection under Transformation Pipelines
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