Enable signaling test
Enable signaling test

If there's issues with signaling, there's no running from them now.
Signaling is an integral part of how Celluloid dispatches calls. If
something's wrong with it, it needs to be reproduced and fixed ASAP.

mehta/celluloid,sideci-sample/sideci-sample-celluloid,dilumn/celluloid,davydovanton/celluloid,olleolleolle/celluloid,jstoja/celluloid,seuros/celluloid,jasonm23/celluloid,tarcieri/celluloid,kenichi/celluloid,marshall-lee/celluloid,celluloid/celluloid,TiagoCardoso1983/celluloid