tests: coverage: report to coveralls (#2287)
tests: coverage: report to coveralls (#2287)

* tests: coverage: report to coveralls

* nyc command change

* refactor testing

googleapis/google-cloud-node,googleapis/google-cloud-node,jgeewax/gcloud-node,GoogleCloudPlatform/gcloud-node,googleapis/google-cloud-node,callmehiphop/gcloud-node,jgeewax/gcloud-node,GoogleCloudPlatform/gcloud-node,callmehiphop/gcloud-node,GoogleCloudPlatform/gcloud-node,googleapis/google-cloud-node