Fix some issues with node 0.6
Fix some issues with node 0.6

drinks/supertest,antoval/supertest,olivier-work/supertest,Floby/megatest,kuychaco/supertest,brigand/supertest,Rob--W/supertest,sam-roth/supertest,olivierrr/supertest,homeopatchy/supertest,visionmedia/supertest,kevinawoo/supertest