Re: [slightlyoff/ServiceWorker] Reporting URL for SW update failures (#877)

F2F:

* Things we might want to report
  * Failed installs
  * Error page served to browser
  * Browser bypassed your SW because it doesn't like it (?)
* Could `respondWith` return something to indicate if fetch accepted the response - but would you have to use `waitUntil` to keep alive for this?
* Could we have a `fetcherror` event which fires if a response returned from fetch was rejected - it would allow you to fall back to default browser behaviour


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