Add a `name` method to `CFTimeZone` to get the time zone ID (e.g.,
"America/Los_Angeles") of the current time zone.
Core Foundation calls this "name" instead of "id" in its method
signatures, but acknowledges it in the closely-related NSTimeZone
related docs. Since most of the other methods in this library match
closely with CF naming, also use `name` here.
> Time zone database entries such as “America/Los_Angeles” are IDs, not
> names. An example of a time zone name is “Pacific Daylight Time”.
> Although many NSTimeZone symbols include the word “name”, they
> actually refer to IDs.
Bruce Mitchener