Re: [slightlyoff/ServiceWorker] Introduce `Service-Worker-Max-Age` header (#721)

> One option is to extend byte-to-byte comparison to the whole imported scripts (importScripts) graph.

+1 for this

**Personally I don't like the idea of having to return a custom header** to force the refresh of the imported scripts. 

This is because at Pushpad (which is a BaaS) we have a script that is imported in our customers' service workers. When we update our script we want the update to be propagated. However **we cannot ask our customers to return custom headers for their service worker (some of them for example have simple websites or blogs powered by Wordpress)**.

I have described more extensively about our situation and why we need automatic updates of the imported scripts in [this blog post](http://blog.pushpad.xyz/2016/07/service-worker-importscripts-never-updates-scripts/).

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