(Review) Added --last Activation Flag  (#2334)

* Added lastFlag to activation logs, result and get along with docs/testing
diff --git a/whisk/activation.go b/whisk/activation.go
index 89eaba6..22e6f6a 100644
--- a/whisk/activation.go
+++ b/whisk/activation.go
@@ -43,7 +43,6 @@
     Logs            []string    `json:"logs"`
     Annotations     KeyValueArr `json:"annotations"`
     Publish         *bool       `json:"publish,omitempty"`
-
 }
 
 type Response struct {