Re: [w3c/manifest] Add offline_url option (#774)

I like the simplicity of this.  Dead simple for devs to understand and I think it would improve the % of sites that have a better than blank" experience, and closely mimic a fairly typical app offline experience in the form of a splash "you're offline" screen.  

Implementation detail: when would the PWA re-sync the cached offline_url?  Would it serve-stale but otherwise obey HTTP header caching rules for the object? 

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