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

The reason I like the `fetcherror` event approach is someone can easily opt-in to the "never show the user an error screen because my SW screwed up" behavior.  They can put this logic in a separate script and just `importScripts()` it in all their SW scripts.  They don't have to worry about integrating it with the rest of their promise chaining.

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