BUG: Fix nansum overflow on Windows with bottleneck#15507

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JaviSorribes wants to merge 6 commits intopandas-dev:masterfrom

JaviSorribes:overflow_nanops

Commits on Feb 25, 2017

BUG: Overflow bug fixed for nansum
Javier Sorribes Camargo
committed
TST: Add numsum overflow test
Javier Sorribes Camargo
committed

Commits on Feb 26, 2017

CLN: Fix linting of ci/lint.sh
Javier Sorribes Camargo
committed
BUG: Fix nansum overflow for Windows
Javier Sorribes Camargo
committed

Commits on Feb 28, 2017

BUG: Disable bottleneck for nansum to avoid overflow
Javier Sorribes Camargo
committed

Commits on Mar 2, 2017

CLN: Remove import os, since not using os
Javier Sorribes Camargo
committed