title: Babel-node doesn't ignore specified files/folder on compilation
body: <p>I have a Node app using ES6 that I run with the following command <code>nodemon cluster.js --exec babel-node</code>.<br>
  I also have a <code>.babelrc</code> file :</p>
  
  <pre><code>{
      "presets": ["es2015"],
      "ignore": [
          "public"
      ]
  }
  </code></pre>
  
  <p>The folder <code>public</code> contains front-end files such as html, css and js. But when I edit a JS file within the public folder, <code>babel-node</code> compiles my code and I don't want this to happen.</p>