Added WSF_ROUTER.has_item_associated_with_resource and item_associated_with_resource

Added WSF_ROUTER_MAPPING.associated_resource
Added WSF_ROUTER_SELF_DOCUMENTATION_HANDLER and WSF_ROUTER_SELF_DOCUMENTATION_MESSAGE to provide a self documentation for WSF_ROUTER (for now, only HTML)

library/server/wsf/router/wsf_router_mapping.e

@@ -13,7 +13,12 @@ feature {NONE} -- Initialization
 		deferred
 		end
 
-feature -- Access		
+feature -- Access
+
+	associated_resource: READABLE_STRING_8
+			-- Associated resource
+		deferred
+		end
 
 	handler: WSF_HANDLER
 			-- Handler associated with Current mapping.