Added OS X ChangeMonitor support; fixed memory leak in Platform::GetFiles.#16

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Bo98 wants to merge 5 commits intogarrynewman:masterfrom Bo98:osx-changemonitor

+122-33

Commits on Apr 16, 2015

Commits on Apr 17, 2015

Fixed a C++11 compile error.
Bo98
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Commits on Apr 18, 2015

OS X ChangeMonitor implementation now uses FSEvents.
Bo98
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Commits on Aug 4, 2015

Fixed OS X ChangeMonitor not returning relative paths.
Bo98
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