title: How to dismiss MWPhotoBrowser while presenting modally?
body: <p>I'm using an MWPhotoBrowser instance to show albums or single images in my app. While using a navigation controller, I can simply press the back button to pop the view controller. 
  I wish to present it modally but I can't figure out how to dismiss it.
  I tried the following code in the hopes that I would be able to swipe down to dismiss, but to no avail.</p>
  
  <pre><code>    let browser = MWPhotoBrowser(photos: photos)
      browser?.delegate = self
      browser?.enableSwipeToDismiss
      self.present(browser!, animated: true, completion: nil)
  </code></pre>
  
  <p>(photos is an array of MWPhoto)</p>
  
  <p>Can anyone point me to a solution? Thanks.</p>