Added 2.4 change log txt (will be moved into the Manual at the end).
Added 2.4 change log txt (will be moved into the Manual at the end).

awils18/incubator-freemarker,woonsan/incubator-freemarker,pradeepmurugesan/incubator-freemarker,pradeepmurugesan/incubator-freemarker,awils18/incubator-freemarker,woonsan/incubator-freemarker