oauth2, oauth2/google: add, use ReuseTokenSource

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>

google/example_test.go

@@ -69,7 +69,7 @@ func ExampleJWTConfigFromJSON() {
 	// Initiate an http.Client. The following GET request will be
 	// authorized and authenticated on the behalf of
 	// your service account.
-	client := conf.Client(oauth2.NoContext, nil)
+	client := conf.Client(oauth2.NoContext)
 	client.Get("...")
 }
 
@@ -101,7 +101,7 @@ func Example_serviceAccount() {
 	}
 	// Initiate an http.Client, the following GET request will be
 	// authorized and authenticated on the behalf of user@example.com.
-	client := conf.Client(oauth2.NoContext, nil)
+	client := conf.Client(oauth2.NoContext)
 	client.Get("...")
 }