Re: [dom] Document.documentURI and Document.URL attributes behaviour (#118)

The same story is for `Node.baseURI` (https://dom.spec.whatwg.org/#dom-node-baseuri). 
Bug https://www.w3.org/Bugs/Public/show_bug.cgi?id=20976 was closed, so I ask here: nullable for this attribute is necessary? Value for document's base URL is some URL (https://dom.spec.whatwg.org/#concept-document-base-url), and default value is "about:blank". Is there any mechanisms that set and return null value for `Node.baseURI`?

I test this behaviour in some methods that create new document (without touching parser HTML/XML) and see:
- Firefox always return `about:blank` what is correct per actual spec
- Chrome and Opera (Presto) always return null what is correct per older spec (but the same happen for `Document.URL` and `Document.documentURI`). Sometimes Chrome can produce correct result and return `about:blank`, for example when we create new IFRAME element, before loading any resources. 
- IE11 doesn't support `Node.baseURI`


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