Windows support for signal handling and dealing with IO#26

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naritta wants to merge 9 commits intotreasure-data:masterfrom naritta:windows-signal-accept

+59-16

Commits on Sep 24, 2015

fix signal and accept_nonblock to adapt to windows
naritta
committed

Commits on Sep 30, 2015

Windows8 doens't support SIGKILL
naritta
committed

Commits on Oct 6, 2015

Commits on Nov 2, 2015

Add Heartbeat pipe for windows
naritta
committed