[whatwg/xhr] null for response in case of invalid JSON (#68)

[JSON body parsing algorithm](https://xhr.spec.whatwg.org/#json-response) states that trying to parse a response which is an invalid JSON (thus, making `JSON.parse` throw an exception) will result in setting `null` to the `response` property. But according to ECMA-404 (but not to [RFC 4627](http://www.ietf.org/rfc/rfc4627.txt)), `null` is a valid JSON. So there is no way to distinct a valid response containing `null` and an invalid JSON.

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