Fix AJAX comment posting. This commit fixes #31

This commit fixes #31

This is just one quick possible way for fixing the AJAX comment posting. Maybe there is a nicer way of doing it or the creation of the comment list can be moved to a better place, but it works for me

When a comment was posted via AJAX the system did not read the existing
comments, therefore the returned value was empty. Fix this by adding a
proper comment list.