title: Gulp - Target all files in a folder and its subfolders
body: <p>I'd like to be able to add a <code>watch</code> task in <code>gulp</code> to all of the <code>js</code> files in the <code>frontend/js</code> and any other js files below</p>
  
  <pre><code> gulp.watch('./frontend/js/**/*.js', ['browserify']);
  </code></pre>
  
  <p>This will only target <code>js</code> files one folder deep</p>