title: Download a file using Nightmare
body: <p>I am using Nightmare to create a automated downloader for today's newspaper. I managed to login and go the the specified page. However I could not find out how to download a file with Nightmare. </p>
  
  <pre><code>var Nightmare = require('nightmare');
  new Nightmare()
    .goto('https://login.nrc.nl/login?service=http://digitaleeditie.nrc.nl/welkom')
      .type('input[name="username"]', 'Username')
      .type('input[name="password"]','Password')
      .click('button[type="submit"]')
      .wait()
      .goto('http://digitaleeditie.nrc.nl/digitaleeditie/NH/2014/10/20141124___/downloads.html')
      .wait()
      .click('a[href="/digitaleeditie/helekrant/epub/nrc_20141124.epub"]')
      .wait()
  
      .url(function(url) {
          console.log(url)
      })
      .run(function (err, nightmare) {
        if (err) return console.log(err);
        console.log('Done!');
      });
  </code></pre>
  
  <p>I tried to download the file by clicking on the download button. However this seems not to work.</p>