Add notify_termination initializers for Windows and Posix.#11

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nat-goodspeed wants to merge 4 commits intoBorisSchaeling:masterfrom

nat-goodspeed:notify_termination

Commits on Nov 25, 2015

Store new pid in posix::executor for initializers to see.
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Add notify_termination initializers for Windows and Posix.
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Commits on Nov 26, 2015

Fix cloned include guards for */initializers/notify_termination.hpp.
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Commits on Nov 28, 2015

Robustify Windows notify_termination GetExitCodeProcess().
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