update build tags (#91)

Author: brianterry

cfn/callback/callback.go

@@ -1,12 +1,12 @@
+// +build callback
+
 /*
 Package callback provides functions for creating resource providers
 that may need to be called multiple times while waiting
 for resources to settle.
 */
 package callback
 
-// +build callback
-
 import (
 	"fmt"
 	"log"

cfn/logging/logging.go

@@ -1,11 +1,11 @@
+// +build logging
+
 /*
 Package logging provides support for logging to cloudwatch
 within resource providers.
 */
 package logging
 
-// +build logging
-
 import (
 	"io"
 	"log"