added a helper to the sandbox section of the readme
added a helper to the sandbox section of the readme

isaacs/nodeunit,caolan/nodeunit,ExtPoint/extnodeunit,zuazo-forks/nodeunit,ExtPoint/extnodeunit,sethmcl/nodeunit,sethmcl/nodeunit,BuZZ-dEE/nodeunit,BuZZ-dEE/nodeunit,caolan/nodeunit,hildjj/nodeunit,hildjj/nodeunit