Add $root refer to component root element#180
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ws-rush wants to merge 2 commits intovuejs:mainfrom
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Some times like in dialogs we need access to root component from child nodes, also it is a way to access root element from `v-scope` . the next snippet from another PR to expose `$el` to scope, but this PR can solve the same problem also
```html
<textarea
v-scope="{width: $root.offsetWidth, height: $root.offsetHeight}"
@click="width = $el.offsetWidth; height = $el.offsetHeight;"
>
{{ width }} × {{ height }}
</textarea>
```
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Some times like in dialogs we need access to root component from child nodes, also it is a way to access root element from
v-scope. the next snippet from another PR to expose$elto scope, but this PR can solve the same problem also