Add virtual destructor to thread.h to prevent undefined behavior on destruction.#25

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DavidBoman wants to merge 1 commit intoivanseidel:masterfrom

exsolvi:PR-VirtualDestructor

Commits on Jul 7, 2017

Add virtual destructor, see: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#discussion-make-base-class-destructors-public-and-virtual-or-protected-and-nonvirtual
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