BUG: Fix categorical formatter not folding the output when it exceeds display width#17639

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Lunran wants to merge 3 commits intopandas-dev:masterfrom

Lunran:bugfix_#12066

Commits on Sep 22, 2017

just copied _format_data(self) from Index to CategoricalFormatter
Lunran
committed

Commits on Sep 23, 2017