Convert errors from dying Celluloid::IO actors into MailboxErrors
Convert errors from dying Celluloid::IO actors into MailboxErrors

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