Replace more magic numbers with constants.
Replace more magic numbers with constants.

mcanthony/openseadragon,mcanthony/openseadragon,Iced-Tea/openseadragon,avandecreme/openseadragon,LarissaSmith/openseadragon,jmnetus/openseadragon,Iced-Tea/openseadragon,lidasong2014/openseadragon,seanich/openseadragon,rdlester/openseadragon,goofwear/openseadragon,shaunstanislaus/openseadragon,rdlester/openseadragon,jmnetus/openseadragon,seanich/openseadragon,openseadragon/openseadragon,shaunstanislaus/openseadragon,goofwear/openseadragon,TMUND/openseadragon,TMUND/openseadragon,ricochet2200/openseadragon,openseadragon/openseadragon,avandecreme/openseadragon,lidasong2014/openseadragon,daverome/openseadragon,ricochet2200/openseadragon,msalsbery/openseadragon,msalsbery/openseadragon,LarissaSmith/openseadragon,daverome/openseadragon