Propogate tag as a functional argument into the notification system to attach

tags to manifest push and pull event notifications.

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>

notifications/event.go

@@ -68,6 +68,9 @@ type Event struct {
 
 		// URL provides a direct link to the content.
 		URL string `json:"url,omitempty"`
+
+		// Tag provides the tag
+		Tag string `json:"tag,omitempty"`
 	} `json:"target,omitempty"`
 
 	// Request covers the request that generated the event.