BUG: Avoid AmbiguousTimeError on groupby#14683

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j-santander wants to merge 4 commits intopandas-dev:masterfrom

j-santander:master

Commits on Nov 17, 2016

Avoid AmbiguousTimeError on groupby
j-santander
committed

Commits on Nov 18, 2016

Commits on Nov 21, 2016

Addressing additional code inspection comments
jsantander
committed