move scale factor so it can be relative to retina screen
move scale factor so it can be relative to retina screen

nyurik/kartotherian,jaredbrookswhite/tilelive-vector,mapbox/tilelive-vector,kartotherian/kartotherian,nyurik/tilelive-vector,nyurik/kartotherian,nyurik/kartotherian,kartotherian/kartotherian,kartotherian/kartotherian,kartotherian/kartotherian,nyurik/kartotherian