README fixups
README fixups

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