Proposing Object.setPrototypeOf() after V8 patch

[here the request in V8 repository with a patch](https://code.google.com/p/v8/issues/detail?id=2645)

The feature/bug request has a working patch attached so it should be straight forward for V8 to implement the change.

Once the patch will be in it is possible for node.js to promote a better/cleaner environment simply warning the deprecated __proto__ for a while and then drop it, hopefully, in V 1.0.0

I've pushed that request in V8 with a patch hoping before 0.12 is out it can be usable already but I have no idea about node.js position on it.

I don't want credits, I don't care about the code, I can sign any paper that says this stuff is not mine.

What node should do, as soon as that patch is in V8, is to use `--expose-proto-setter` flag in `d8` when launched ... obviously, if that's possible.

Thanks for the consideration and any sort of outcome this request will have.