cloned group tests for scatter plot
cloned group tests for scatter plot

not that I had any doubts here, just affirming

for #1239

TheDataShed/dc.js,TheDataShed/dc.js,aaronhoffman/dc.js,mtraynham/dc.js,aaronhoffman/dc.js,mtraynham/dc.js,mtraynham/dc.js,aaronhoffman/dc.js,mtraynham/dc.js,dc-js/dc.js,dc-js/dc.js,TheDataShed/dc.js,aaronhoffman/dc.js,TheDataShed/dc.js,TheDataShed/dc.js,aaronhoffman/dc.js,dc-js/dc.js,dc-js/dc.js,dc-js/dc.js,mtraynham/dc.js