added catalogue event support

src/main/java/org/gcube/social_networking/socialnetworking/model/beans/catalogue/CatalogueEventType.java

@@ -2,9 +2,25 @@ package org.gcube.social_networking.socialnetworking.model.beans.catalogue;
 
 public enum CatalogueEventType {
 	/**
-	 * use to notify a user she got a workspace item new in some of her workspace shared folder
+	 * Someone publishes a new item
 	 */
-	ITEM_PUBLISHED;
+	ITEM_PUBLISHED,
+	/**
+	 * Someone submits an item for consideration (only for catalogue moderators)
+	 */
+	ITEM_SUBMITTED,
+	/**
+	 * Someone rejects a submitted item  (only for item creators and catalogue moderators)
+	 */
+	ITEM_REJECTED,
+	/**
+	 *  Someone removes an item
+	 */
+	ITEM_REMOVED,
+	/**
+	 * Someone updates an item 
+	 */
+	ITEM_UPDATED;
 
 	
 }