GeezerVison

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AIO is currently using a beta version of @angular/service-worker.
Since that was implemented, the SW has been rewritten and released
as part of Angular 5.0.0. This commit updates AIO to use the latest
implementation, with an appropriate configuration file that caches
the various AIO assets in useful ways.

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…vkit/build-angular to 0.7.0-rc.3 (#25997)

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The is a bug in versions 0.6.8+ that breaks when trying to use Jasmine's
mock clock.

Related to angular/angular-cli#11626.

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This allows URLs to be passed through to the server (where they are
properly redirected), instead of serving `index.html` from the SW.

Known issue:
`/docs/` will be passed through to the server. `/docs` (without the
trailing slash) will be correctly treated as a navigation URL and
handled by the SW.
We don't link to `/docs/` from within the app, but if there are external
links to `/docs/` they will require a round-trip to the server and will
not work in offline mode.

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Firebase used to do it automatically (with `cleanUrls: true`), but it
stopped doing it unless the resulting URL corresponds to an existing
file (which is not always the case in angular.io; e.g. the resulting URL
might be matched by a new redirect rule).
This change in Firebase hosting behavior resulted in some URLs not being
correctly redirected (e.g. URLs to the archived v2 site, or `.html`
suffixed URLs from 3rd-party sites).

This commit fixes it, by configuring Firebase hosting to strip off the
`.html` extension and redirect (if no other redirect rule matched).

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