Since 3fbb5f1535 "luaobject: emit signals on class too" when a signal
is emitted on some object, it will also be emitted on the class. This means that
we don't have to connect our signals via the "new" signal anymore, but can
instead connect to the signal on the class.
(Of course, the signal on the class gets as first argument the object on which
the signal was emitted)
Signed-off-by: Uli Schlachter <psychon@znc.in>