loopTags not working with multiple tags

For example:

```js
loopTags: ['for', 'each']
```

```html
<each loop="item in array">
  {{ item }}
</each>

<for loop="item in array">
  {{ item }}
</for>
```

Currently it doesn't work, because the plugin only looks at the first tag in `loopTags`, it sees that it's `for`, and it fails.

Working on a PR right now.