title: Clipboard change event in electron
body: <p>I'd like to write a clipboard manager that monitors the systems' clipboard. Well I have found: <a href="https://github.com/atom/electron/blob/master/docs/api/clipboard.md" rel="nofollow">https://github.com/atom/electron/blob/master/docs/api/clipboard.md</a>, but couldn't find any events for the clipboard.</p>
  
  <p>Do clipboard events exist in electron? I mean like <code>QClipboard</code>'s <code>void selectionChanged()</code> and <code>void dataChanged()</code> or like GTK's owner-changed</p>
  
  <p>Currently I'm retrieving the contents of the clipboard and look manually whether the content has changed every 20ms, which should not be the preferred way. It works but I really shouldn't resort to a busy polling loop...</p>