TODO for brach namespace_handling_refactor:

- refactor code in
  * Catalyst::Dispatcher::get_containers           # No Idea
  * Catalyst::Dispatcher::dispatch_type            # DONE

  * Catalyst::Controller::_parse_ActionClass_attr  # DONE
  * Catalyst::Dispatcher::_load_dispatch_types     # DONE
  * Catalyst::setup_plugins                        # DONE
  to use the same namespacing method

- Ok, so can you add tests for ->config(actions => { foo => { ActionClass => '+Bar' }});