Microtask scheduling

[Benjamin Gruenbaum]

Addressing the original request:

> Any chance something like Node's process.nextTick could be added, maybe
something like Promise.schedule(func, thisArg, ...args)?

That's basically `Promise.resolve().then(func.bind(thisArg, ...args))`

Although promise schedulers are huge - and I think could solve a lot of
problems people are having - but that's besides this issue.
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