Cliff has moved to the `openstack` namespace. Update README.HEADmaster

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-==============
- Introduction
-==============
-
-The cliff framework is meant to be used to create multi-level commands
-such as subversion and git, where the main program handles some basic
-argument parsing and then invokes a sub-command to do the work. 
-
-Command Plugins
-===============
-
-Cliff takes advantage of Python's ability to load code dynamically to
-allow the sub-commands of a main program to be implemented, packaged,
-and distributed separately from the main program. This organization
-provides a unified view of the command for *users*, while giving
-developers the opportunity organize source code in any way they see
-fit.
-
-Cliff Objects
-=============
-
-Cliff is organized around four objects that are combined to create a
-useful command line program.
-
-The Application
----------------
-
-An :class:`cliff.app.App` is the main program that you run from the shell
-command prompt. It is responsible for global operations that apply to
-all of the commands, such as configuring logging and setting up I/O
-streams.
-
-The CommandManager
-------------------
-
-The :class:`cliff.commandmanager.CommandManager` knows how to load
-individual command plugins. The default implementation uses
-`setuptools entry points`_ but any mechanism for loading commands can
-be used by replacing the default :class:`CommandManager` when
-instantiating an :class:`App`.
-
-The Command
------------
-
-The :class:`cliff.command.Command` class is where the real work
-happens. The rest of the framework is present to help the user
-discover the command plugins and invoke them, and to provide runtime
-support for those plugins. Each :class:`Command` subclass is
-responsible for taking action based on instructions from the user. It
-defines its own local argument parser (usually using argparse_) and a
-:func:`take_action` method that does the appropriate work.
-
-The Interactive Application
----------------------------
-
-The main program uses an :class:`cliff.interactive.InteractiveApp`
-instance to provide a command-shell mode in which the user can type
-multiple commands before the program exits. Many cliff-based
-applications will be able to use the default implementation of
-:class:`InteractiveApp` without subclassing it.
-
-.. _setuptools entry points: http://packages.python.org/distribute/setuptools.html
-
-.. _argparse: http://docs.python.org/library/argparse.html