added "ControllerManager" Manager, and make "ControllerLoader" as alias of it

for consistency, "ControllerLoader" should be named "ControllerManager". It not BC break because of I made new Factory named ControllerManagerFactory and point ControllerLoader as alias of ControllerManager. It can be a preparation for ZF3. When ZF3 released, the "ControllerLoader" manager can be completely removed.