add default value for ratio to the api docs
add default value for ratio to the api docs

shevawen/openlayers,owenmead/openlayers,tschaub/openlayers-raster,openlayers/ol2,openlayers/ol2,avinet/openlayers,dracic/openlayers,sbrunner/openlayers,pvalsecc/openlayers,ahocevar/ol2,ahocevar/ol2,v5analytics/openlayers,PublicStuff/openlayers,elbakai/openlayers,sanak/ol2,sbrunner/openlayers,pvalsecc/openlayers,colllin/openlayers,wet-boew/openlayers,colllin/openlayers,owenmead/openlayers,shevawen/openlayers,PetrDlouhy/openlayers,pgiraud/openlayers,v5analytics/openlayers,Gnafu/openlayers,Gnafu/openlayers,altamiracorp/openlayers,georchestra/openlayers,PetrDlouhy/openlayers,pgiraud/openlayers,openlayers/ol2,tschaub/openlayers-raster,adh1365/openlayers,adh1365/openlayers,pgiraud/openlayers,Gnafu/openlayers,owenmead/openlayers,colllin/openlayers,kartverket/openlayers,avinet/openlayers,georchestra/openlayers,colllin/openlayers,boundlessgeo/openlayers,adh1365/openlayers,shevawen/openlayers,pvalsecc/openlayers,pvalsecc/openlayers,altamiracorp/openlayers,sanak/ol2,sbrunner/openlayers,kartverket/openlayers,kartverket/openlayers,boundlessgeo/openlayers,openlayers/ol2,Gnafu/openlayers,altamiracorp/openlayers,boundlessgeo/openlayers,adh1365/openlayers,v5analytics/openlayers,elbakai/openlayers,sanak/ol2,dracic/openlayers,wet-boew/openlayers,avinet/openlayers,altamiracorp/openlayers,owenmead/openlayers,PublicStuff/openlayers,sanak/ol2,sbrunner/openlayers,avinet/openlayers,georchestra/openlayers,v5analytics/openlayers,PublicStuff/openlayers,PublicStuff/openlayers,dracic/openlayers,boundlessgeo/openlayers,wet-boew/openlayers,tschaub/openlayers-raster,wet-boew/openlayers,PetrDlouhy/openlayers,dracic/openlayers,ahocevar/ol2,pgiraud/openlayers,elbakai/openlayers,kartverket/openlayers,PetrDlouhy/openlayers,elbakai/openlayers,shevawen/openlayers