[slightlyoff/ServiceWorker] Recovering from fetch failures (#939)

If your SW is buggy, or something changes in a particular browser that causes it to start throwing errors, the user gets nothing until you fix your SW (unless the browser provides a "retry without service worker" feature).

It'd be nice to allow the developer to recover in these cases

In many cases, a `.catch()` at the end of the `respondWith` promise lets them do that, but not in the case of a response that fetch deems unacceptable, eg an opaque response to a CORS request.

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https://github.com/slightlyoff/ServiceWorker/issues/939