title: What is the ** glob character?
body: <p>I have this path in my react gulpfile:</p>
  
  <pre class="lang-javascript prettyprint-override"><code>var path = {
    HTML: 'src/index.html',
    ALL: ['src/js/*.js', 'src/js/**/*.js', 'src/index.html'],
    JS: ['src/js/*.js', 'src/js/**/*.js'],
    MINIFIED_OUT: 'build.min.js',
    DEST_SRC: 'dist/src',
    DEST_BUILD: 'dist/build',
    DEST: 'dist'
  };
  </code></pre>
  
  <p>What is the double glob character?</p>
  
  <p>I know what the single glob is... but what is the double?
  <a href="https://en.wikipedia.org/wiki/Glob_(programming)">single glob</a></p>