travis testing against 0.12, 2, 4
travis testing against 0.12, 2, 4

googleapis/cloud-debug-nodejs,DominicKramer/cloud-debug-nodejs,ofrobots/cloud-debug-nodejs,matthewloring/cloud-debug-nodejs,DominicKramer/cloud-debug-nodejs,ofrobots/cloud-debug-nodejs,matthewloring/cloud-debug-nodejs,DominicKramer/cloud-debug-nodejs,googleapis/cloud-debug-nodejs,matthewloring/cloud-debug-nodejs,ofrobots/cloud-debug-nodejs,googleapis/cloud-debug-nodejs