Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

Not sure if this was proposed yet, but how about stuffing the supported options onto the functions/methods that take them?
If I want to know how to call `someElem.addEventListener(...)`, I'll probe `someElem.addEventListener.supportedOptions` or `someElem.addEventListener.AddEventListenerOptions` or something like that.  
Minimal namespace pollution, and a pretty obvious place to look?

(For dictionaries taken by multiple functions, or methods that exist on multiple objects, such as `.addEventListener`, the specific standard should probably promise that the supported options are same for all places.  Or not.)

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