Re: [w3c/webcomponents] ES5 consideration for custom elements (#423)

All, the strict enforcement of super means that transpilers can not compile to ES5 without using Reflect.construct because Reflect.construct won't work in anything below Edge 12.

This is a bad because not everyone is off of IE 10 or 11 yet, and there's no way to transpile this to a format that doesn't use `new.target` or `Reflect.construct`.

What this means is that people transpiling this to ES5 and using a Custom Elements v1 will get lucky that it works in IE10, but then they'll get this error in new browsers like Chrome:

```
Uncaught TypeError: Failed to construct 'HTMLElement': Please use the 'new' operator, this DOM object constructor cannot be called as a function
```

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