Add os.homedir to node lib
Add os.homedir to node lib

Summary:
https://nodejs.org/api/os.html#os_os_homedir
Closes https://github.com/facebook/flow/pull/1264

Reviewed By: svcscm

Differential Revision: D2819509

Pulled By: mroch

fb-gh-sync-id: 34882ef350eb2031cb2e5a490cf8e45ae5816902

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