fix issue #500: do not hold mailbox lock while calling reactor wakeup routine
fix issue #500: do not hold mailbox lock while calling reactor wakeup routine

davydovanton/celluloid,dilumn/celluloid,kenichi/celluloid,olleolleolle/celluloid,seuros/celluloid,jasonm23/celluloid,celluloid/celluloid,marshall-lee/celluloid,TiagoCardoso1983/celluloid