Use `printf %q` for simplicity and binary safety#9

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Artoria2e5 wants to merge 4 commits intogfredericks:masterfrom Artoria2e5:patch-2

+15-131

Commits on Sep 16, 2016

Use printf %q for simplicity and binary safety
Artoria2e5
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Commits on Sep 18, 2016

test: binary-safe escape
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Commits on Sep 19, 2016

fix deletion of "weird" keys
Artoria2e5
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Commits on Sep 20, 2016

silent printf %q if there is nothing to print
Artoria2e5
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