Removing old config directories that used the old config system.

Adding files for the refactored kernel scripts.

Lots more work on the kernel scripts.

Semi-working refactored ipcluster. This version uses the NotificationCenter, which I am not sure I like. But, it is important to see how all of this works.

ipcontroller/ipengine use the new clusterdir.py module.

Minor revisions to ipengine_config.py

The ipengine script has been refactored to use the new config system. It is also now a formal Application: IPython.kernel.ipengineapp

Removing old ipcontroller.py

Finished refactoring ipcontroller to be a proper application. * The :command:`ipcontroller` script has been refactored into a proper IPython application that uses the new config system. This also introduces the idea of an application directory, which for :command:`ipcontroller` is :file:`cluster_<profile>` by default. This cluster directory has the config file, the log directory and the security directory for the controller and engine.

Work on ipcontroller. * The IPControllerApp now uses ApplicationWithDir to manage the app_dir. * The setup.py script and ipcontroller script have been updated to use the new IPControllerApp. * launch_new_instance created and being used.