Re: [whatwg/dom] Change .createElement() namespace to match UAs (#213)

Any infos what Edge or WebKit set for `contentType` when using createDocument()? IE11 not support this IDL attribute.
```js
console.log(document.implementation.createDocument("http://www.w3.org/1999/xhtml", "html", null).contentType);
console.log(document.implementation.createDocument("http://www.w3.org/2000/svg", "svg", null).contentType);
console.log(document.implementation.createDocument("http://www.w3.org/1998/Math/MathML", "math", null).contentType);
```
Firefox and Opera(Presto): `application/xml application/xml application/xml`
Chrome: `application/xhtml+xml image/svg+xml application/xml`
WebKit?
Edge?

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