Vue does not handle prop named value well

Setting `value` as property on a custom element fails. It gets passed as a string [Object Object] instead.

```html

```
```js
new Vue({
el: '#app',
data: {
message: {'hello': 'world'}
}
})
```
Codepen to reproduce: https://codepen.io/tornadoalert/pen/rNjVzbd