Added arn to the main repository

arn/HasEditor.go

@@ -0,0 +1,13 @@
+package arn
+
+// HasEditor includes user ID and date for the last edit of this object.
+type hasEditor struct {
+	Edited   string `json:"edited"`
+	EditedBy string `json:"editedBy"`
+}
+
+// Editor returns the user who last edited this object.
+func (obj *hasEditor) Editor() *User {
+	user, _ := GetUser(obj.EditedBy)
+	return user
+}