fade out flashed messages

templates/download.html

@@ -34,6 +34,9 @@
             format:'YYYY-MM-DD HH:mm',
             sideBySide: true
         });
+        $(".alert").delay(4000).fadeOut(500, function() {
+            $(this).alert('close');
+        });
     });
 </script>
 {% endblock %}