Add support for running with a single object of tests rather than files.
Add support for running with a single object of tests rather than files.

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