seemingly wrong brush selector
seemingly wrong brush selector

that often worked
thanks @paulbriton for tracking this down!
this seems to be a mistake introduced in 354b890
fixes #1134

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