Add NIO::Monitor#io reader on JRuby
Add NIO::Monitor#io reader on JRuby

celluloid/nio4r,marshall-lee/nio4r,marshall-lee/nio4r,tpetchel/nio4r,tpetchel/nio4r,celluloid/nio4r,celluloid/nio4r,frsyuki/nio4r,marshall-lee/nio4r,tpetchel/nio4r,frsyuki/nio4r,frsyuki/nio4r