[WIP] Categorical split for decision tree#3346

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MatthieuBizien wants to merge 18 commits intoscikit-learn:masterfrom

MatthieuBizien:categorical_split

Commits on Jul 11, 2014

Added TODO after discussion in pull request
MatthieuBizien
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Commits on Jul 14, 2014

Added option is_categorical to Splitter
MatthieuBizien
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Commits on Jul 15, 2014

Use criterion in categorical BestSplitter
MatthieuBizien
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