title: how can component delete itself in Vue 2.0
body: <p>as title, how can I do that</p>
  
  <p>from offical documentation just tell us that $delete can use argument 'object' and 'key'</p>
  
  <p>but I want delete a component by itself like this</p>
  
  <pre><code>this.$delete(this)
  </code></pre>