jswrapper doesn't check inheritance properly

[gfwilliams]

For instance if we have HttpServer which we want to be extended from EventEmitter (both of which are built-in) we can't do this currently, because jswrapper only checks HttpServer for built-in functions, not EventEmitter too.

[gfwilliams]

This is becoming more of an issue with Streams. Ideally we'd be able to specify in the wrapper that it implemented 'stream.Readable' and instantly get read/available/pipe put in for us.

[gfwilliams]

This would be fixed with #2181