django.contrib.comments sends a comment_was_posted signal when a new comment is created. Marking a comment as removed (is_removed=True) should send a comment_removed signal for third party apps that need to take into account a comment being removed from the system.
The same signal should also be triggered if a comment is deleted. So perhaps a post_delete on comments.get_model() could also send this signal.
fix for #7. implementing a comment_removed signal for other apps to l…
…isten for. comment_removed is sent when a comment is deleted or when a comment's is_removed attribute is flipped from True to False.