version: Added erase callback and delete method

Added erase callback, and delete method
as part of implementing image Object.Delete
to delete images.

Change-Id: If3251138c79e05693217fa3ae3f5b238e9c61df4
Signed-off-by: Leonel Gonzalez <lgonzalez@us.ibm.com>
diff --git a/activation.hpp b/activation.hpp
index f550e37..41d055e 100644
--- a/activation.hpp
+++ b/activation.hpp
@@ -142,6 +142,9 @@
          */
         Activations activation(Activations value) override;
 
+        /** @brief Activation */
+        using ActivationInherit::activation;
+
         /** @brief Overloaded requestedActivation property setter function
          *
          * @param[in] value - One of Activation::RequestedActivations