Re: [manifest] Integration with service workers (#161)

I still think the developers lose significant functionality if we add this. It is not uncommon to communicate with the SW during install over `postMessage()`, for instance. Also, if installation fails, you don't have any way to recover (as you would with the API). 

This is why I really dislike this proposal over just declaring it in the start URL. SWs usage is more complicated than simply install and caching files - hence this will only help but the most limited of web applications; everyone else will need to still use the API.

Additionally, if users are arriving at the applications page without being redirected from the `start_url`, one would still need to include the standard SW registration dance (hence again having in the manifest is redundant). 

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