[dev] added Notification::count()

[David Ulevitch]

This might be useful to some people:

In Notification.php:

function count($my_listener = '') {
 if ($my_listener == '') {
  $count = 0;
  foreach ($this->listeners as $listener) {
   $count += count($_SESSION['hordeMessageStacks'][$listener->getName()]);
  }
  return $count;
 } else {
  return
count($_SESSION['hordeMessageStacks'][$this->listeners[$my_listener]->getName()]);
 }
}

I needed it because I test if there are a certain amount of errors it send
them to a massive oops page.

thanks,
davidu
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