Standardizing __proto__

[John-David Dalton]

@Oliver
> That said your examples environments that support it is slightly misleading as there's only a few JS engines being used between them: Caraken
> (Opera person is this correct?), JavaScriptCore, SpiderMonkey and V8.   AIR uses webkit so pulls in JSC, and presumably ActionScript as well,
> although ActionScript is not really an ES engine so i'm unsure if it counts to this discussion.

The point is __proto__ has a very long history and is supported by
more browsers/environments than it's not.

@Mike Shaver
For other possible uses please check out:
http://msdn.microsoft.com/en-us/scriptjunkie/gg278167
https://github.com/jdalton/fusebox#readme
and follow the bug report.