Merge pull request #261 from owncloud/fix_opera_file_delete

fix file delete in opera - fixes #188

apps/files/js/filelist.js

@@ -375,4 +375,7 @@ $(document).ready(function(){
 			FileList.lastAction();
 		}
 	});
+	$(window).unload(function (){
+		$(window).trigger('beforeunload');
+	});
 });