[w3c/push-api] Retry push event (#300)

In the [working draft](https://www.w3.org/TR/push-api/) I cannot find anything about retries for the `push` event.

When our service worker receives a `push` event it tries to `fetch` the notifications from the *application server*. What if a network error occurs? (e.g. the user is on an unreliable network or the server is temporary down)

I think that it would be useful to always retry the `push` event with exponential backoff when an exception occurs: what do you think? Currently I don't see any way for the developer to create a reliable `push` handler.

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