[whatwg/fetch] See if resource exists (#428)

Per [stackoverflow](http://stackoverflow.com/questions/7035466/check-if-file-exists-but-prevent-404-error-in-console-from-showing-up) and others, it would be nice to have a way to see if a resource exists that doesn't always, forcibly result in an error in the console.

Perhaps a new option could be created to be silent during failure?

Given that Fetch resolves all responses (4xx, 5xx included), it seems odd that a response would resolve but still forcibly generate an error that the developer has no way to block.

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