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Fix activation issue caused by existing webhook

https://trello.com/b/JlrNdovY/hound
Ignore function declarations in JSHint

Avoids an error where JSHint was producing a violation if a function was used
before its declaration, which is completely valid in JS.
Allow specific orgs to bypass CC payment

https://trello.com/c/qhVm4brL/379-allow-special-bulk-pricing-for-organizations

* Add orgs to EXEMPT_ORGS environment variable as comma separated list