locate _mocha by path for appveyor: https://github.com/gotwarlost/istanbul/issues/90
locate _mocha by path for appveyor: https://github.com/gotwarlost/istanbul/issues/90

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