Re: [sensors] Add solution for one-shot readings

re @domenic's 
[comment](https://github.com/w3c/sensors/issues/88#issuecomment-193306303):

Thanks for your input. In such a case, I imagine `start()` would be 
async and would trigger the permission request (probably both 
returning a promise AND triggering an error event in case the 
permission was rejected). 

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Received on Thursday, 10 March 2016 13:20:29 UTC