title: Enable copy paste option in CKEditor source mode
body: <p>Trying to enable copy paste option in CKEditor source mode,
  for example<br>
  1. select some text in source mode<br>
  2. right click on the text or do CTRL+C to copy the text<br>
  3. again right click or do CTRL+V to paste the copied text  </p>
  
  <p>In my case in source mode it doesn't copy the selected text to clip board and it doesn't fire paste events as well,tried debugging clipboard paste event  </p>
  
  <p>can someone please help on this how i can check why its not firing the event in source mode. but works/fires the event in WYSIWYG mode.   </p>
  
  <p>Also is there any way i can debug clipboard plugin.js file, tried putting "debuger;" but doesn't stop there also doesnt load in developer tools   </p>
  
  <p>No errors in console 
  No customization on CKEditor 4.5.7 version</p>