Fix colorScale to duplicate getExtent logic from OrdinalScale, pending better fix for #388
Fix colorScale to duplicate getExtent logic from OrdinalScale, pending better fix for #388

danmane/plottable,palantir/plottable,RobertoMalatesta/plottable,danmane/plottable,softwords/plottable,jacqt/plottable,onaio/plottable,NextTuesday/plottable,gdseller/plottable,jacqt/plottable,palantir/plottable,RobertoMalatesta/plottable,jacqt/plottable,NextTuesday/plottable,gdseller/plottable,gdseller/plottable,onaio/plottable,alyssaq/plottable,alyssaq/plottable,RobertoMalatesta/plottable,softwords/plottable,iobeam/plottable,NextTuesday/plottable,iobeam/plottable,iobeam/plottable,softwords/plottable,danmane/plottable,palantir/plottable,onaio/plottable,palantir/plottable,alyssaq/plottable