Re: [push-api] Move to using just endpoint (#129)

I think it is way better to understand. 

The only minor things I found: Shouldn't clear push subscription happen after unsubscription, so that you can wait for it to resolve successfully before you delete it? 
And I find "set push subscription" not very informative, why not take the old "store push subscription" or "save push subscription", or was there another thought behind?

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https://github.com/w3c/push-api/pull/129#issuecomment-93862834