Check for correct env keys in `Command`#39338

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tbu- wants to merge 3 commits intorust-lang:masterfrom tbu-:pr_check_valid_env

+81-22

Commits on Feb 15, 2017

Check for correct env keys in Command
tbu-
committed

Commits on Feb 17, 2017

Check Windows env keys for interior =
tbu-
committed

Commits on Mar 7, 2017

Add println!-debugging
tbu-
committed