MAINT: use int for groupby#92

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vikram-narayan wants to merge 3 commits intomasterfrom

Commits on Apr 16, 2018

MAINT: use int for groupby
vikram-narayan
committed

Commits on Apr 17, 2018

TST: test that exposures don't depend on index name
vikram-narayan
committed

Commits on Aug 22, 2019

Merge branch 'master' into change-groupby
twiecki
authored