…tion, it will be called with a model instance as a parameter to get moderator list instead of hardcoded settings MODERATOR_LIST

…s. Sometimes model should be saved several times before notify moderators about event. Also, notification code now executed each time model is saved, not only after creation. This way moderators will see also edit events.

… the notification message

for getting approved and unmoderated objects

It adds is_approved, is_rejected and is_pending methods
for moderated objects witch is useful in templates.