fix and test index division by zero#19347

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jbrockmendel wants to merge 24 commits intopandas-dev:masterfrom

jbrockmendel:div_zero2

Commits on Jan 22, 2018

Commits on Jan 23, 2018

Commits on Jan 24, 2018

Commits on Jan 28, 2018

Merge branch 'master' of https://github.com/pandas-dev/pandas into div_zero2
jbrockmendel
committed

Commits on Jan 29, 2018

Commits on Feb 1, 2018

Commits on Feb 2, 2018