Port Timedelta implementation to tslibs.timedeltas#17937

Merged

jreback merged 10 commits intopandas-dev:masterfrom

jbrockmendel:tslibs-timedeltas5

Nov 3, 2017

Commits on Oct 22, 2017

Commits on Oct 31, 2017

Commits on Nov 1, 2017

Merge branch 'master' of https://github.com/pandas-dev/pandas into tslibs-timedeltas5
jbrockmendel
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