Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

Thanks. I think we can close this issue. Please feel free to re-open this if required.
Let me address some comments as separate issues, like #306.

One more note I can add here is that we might want to support the following use case in the future:

```html
 <table>
  SR
    <slot name="th"></slot>
    <slot name="tr"></slot>

  <th slot="th">...</th>
  <tr slot="tr">...</tr>
```
   
In this case, I guess no one is pleasant that `<slot>` would appear in the middle of `<table>` and `<tr>` in the composed tree.


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