properly disable non-fiber JRuby specs
properly disable non-fiber JRuby specs

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