Memory leak caused by Gulpfile's nodemon task.

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From gulpfile.js in chapter 19.

gulp.task('nodemon', function() {
  nodemon({
    script: 'server.js',
    ext: 'js less html'
  })
    .on('start', ['watch'])
    .on('change', ['watch'])
    .on('restart', function() {
      console.log('Restarted!');
    });
});

Everytime a file changes, you're triggering watch which attaches additional listeners. After a few restarts, you will exceed the max number of listeners.

This should be rewritten to avoid memory leaks. Just remove the line which starts watch on change. It's redundant since start is triggered on restart anyway. I have made a pull request with the necessary fix.