some tests of filtering geo externally
some tests of filtering geo externally

supposedly for #1239 but not breaking because of the weird
way geo binds data

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