Token caching is now done whenever you make a Client, and
ReuseTokenSource is exported from the oauth2 package and used by the
Google TokenSources (Compute and App Engine).
Token.Expired is now Token.Valid, and works on nil receivers.
Some other wording cleanups in the process.
All tests pass. App Engine should pass, but is untested.
Change-Id: Ibe1d2599ac3ccfe9b399b1672f74bb24cfc8d311
Reviewed-on: https://go-review.googlesource.com/2195
Reviewed-by: Burcu Dogan <jbd@google.com>
The comments already live in oauth2.go.
Change-Id: I103113fbc8138b242cb6f79052fdc6b29bf6f031
Reviewed-on: https://go-review.googlesource.com/2131
Reviewed-by: Andrew Gerrand <adg@golang.org>