docs: pubsub delete topic
docs: pubsub delete topic

In v1beta2, deleting a topic does *not* delete corresponding subscriptions

"Deletes the topic with the given name. Returns NOT_FOUND if the topic does
 not exist. After a topic is deleted, a new topic may be created with the
 same name; this is an entirely new topic with none of the old configuration
 or subscriptions. Existing subscriptions to this topic are not deleted."

source: <https://cloud.google.com/pubsub/reference/rest/v1beta2/projects/topics/delete>

authbox-lib/gcloud-node,pcostell/gcloud-node,savethefails/gcloud-node,VikramTiwari/gcloud-node,jmptrader/gcloud-node,savethefails/gcloud-node,SimpleEmotion/gcloud-node,jgeewax/gcloud-node,jcking/google-cloud-node,mziccard/gcloud-node,savethefails/gcloud-node,stephenplusplus/gcloud-node,callmehiphop/gcloud-node,pcostell/gcloud-node,nemo/gcloud-node,ofrobots/google-cloud-node,t9nf/gcloud-node,googleapis/google-cloud-node,authbox-lib/gcloud-node,nemo/gcloud-node,nemo/gcloud-node,Muffasa/gcloud-node,jmptrader/gcloud-node,jcking/google-cloud-node,googleapis/google-cloud-node,VikramTiwari/gcloud-node,chrishiestand/gcloud-node,tcrognon/google-cloud-node,chrishiestand/gcloud-node,Muffasa/gcloud-node,jgeewax/gcloud-node,GoogleCloudPlatform/gcloud-node,callmehiphop/gcloud-node-ghpages,pcostell/gcloud-node,GoogleCloudPlatform/gcloud-node,chrishiestand/gcloud-node,mziccard/gcloud-node,ofrobots/google-cloud-node,Muffasa/gcloud-node,GoogleCloudPlatform/gcloud-node,callmehiphop/gcloud-node,t9nf/gcloud-node,tcrognon/google-cloud-node,authbox-lib/gcloud-node,stephenplusplus/gcloud-node,ofrobots/google-cloud-node,googleapis/google-cloud-node,SimpleEmotion/gcloud-node,SimpleEmotion/gcloud-node,callmehiphop/gcloud-node-ghpages,VikramTiwari/gcloud-node,stephenplusplus/gcloud-node,t9nf/gcloud-node,jcking/google-cloud-node,googleapis/google-cloud-node