BUG: Concatenation of DFs with all NaT columns and TZ-aware ones breaks #12396#12403

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multiloc wants to merge 3 commits intopandas-dev:masterfrom

multiloc:bugfix_12396

Commits on May 8, 2016

handle tz-aware all NaT concatenation incl. mixed cases (GH12396)

multiloc
authored and
afragner
committed
improve tests for all-NaT concatenation (GH12396)
afragner
committed
clean up tests for GH12396
afragner
committed