title: Nuxt.js: weird behavior on two or more <nuxt-child> on same directory
body: <p>in Nuxt, with this folder structure.</p>
  <pre><code>main
  ├── parent1
  │   └── index.vue
  ├── parent2
  │   └── index.vue
  ├── _parent1.vue
  ├── _parent2.vue
  </code></pre>
  <p>_parent1.vue and _parent2.vue contains <code>&lt;nuxt-child&gt;</code> tag inside and supposedly render the contents of parent1/index.vue parent2/index.vue contents respectively.</p>
  <p>but... when accessing ~/main/parent1 and ~/main/parent2 route, both shows the content of _parent1.vue!!! or whichever component that comes first alphabetically.</p>
  <p>is it a known bug? are there any solution to make is work as expected?</p>
  <p>edit: added underscore to parent file</p>