Rename Storage examples from "var storage" to "var gcs" #619
Description
Continues #617 (diff)...
It seems a lot of people refer to "Cloud Storage" as "GCS" as opposed to "Storage". In userland, I've seen var gcs = gcloud.storage(/*...*/); more than once, and tend to prefer that name over the more generic "var storage;" naming.
Any thoughts on changing our Storage examples to use var gcs = gcloud.storage(); in place of var storage = gcloud.storage();? The term "storage" feels vague to me, instead of implying that it offers functionality that sits above a bucket.