Fix show/hide logic and tests
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Merge branch 'master' of github.com:humanmade/Custom-Meta-Boxes into dev
Merge branch 'dev' of github.com:humanmade/Custom-Meta-Boxes into dev
Merge pull request #262 from humanmade/show-hide-logic-and-tests

Fix show/hide logic and tests
Merge branch 'master' of github.com:humanmade/Custom-Meta-Boxes into dev