remove extra comma from package.json
remove extra comma from package.json

sethmcl/nodeunit,sethmcl/nodeunit,caolan/nodeunit,ExtPoint/extnodeunit,ExtPoint/extnodeunit,1602/nodeunit,BuZZ-dEE/nodeunit,caolan/nodeunit,hildjj/nodeunit,hildjj/nodeunit,robert-berg/rjberg-nodeunit,zuazo-forks/nodeunit,BuZZ-dEE/nodeunit,isaacs/nodeunit