DataFrameMapper using FeatureUnion#64

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dukebody wants to merge 4 commits intomasterfrom

feature_union_pipe

Commits on Aug 4, 2016

added a data frame mapper which uses just Pipeline and FeatureUnion

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Make DFMapper use FeatureUnion and delete deprecated cross_validation functionality.
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Commits on Aug 26, 2016

Add some tests for utils. Make ColumnSelect return np.array instead of pandas object.
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Commits on Aug 27, 2016

New simplified naming for transformer steps and get/set_params methods to do gridsearch.
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