reduce MRIs in Travis matrix to ruby-{2.2.0,head}
reduce MRIs in Travis matrix to ruby-{2.2.0,head}

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