b10540a0b5b2af3f5b9d8ba3dae8267eac3dc83f

Service Workers can be tricky to work with in production, and often it becomes necessary to deactivate an existing SW. This is trickier than one might imagine - as long as clients on the old SW may exist it is important to serve some script at the old SW URL. This commit adds safety-worker.js to the published NPM package, which is useful for that purpose. On install the SW unregisters itself which safely and gradually allows older clients to update. PR Close #21863
Safari (7+), iOS (7+) and IE mobile (11) are tested on BrowserStack.
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