The user may define parameters needed by the os_type classes to perform
the system preparation tasks.

A new needed_sysprep_params method is added to os_type.OSBase that
returns a list with parameters that should be defined by the user.

In the documentation and the printed messages, remove all references
to ~okeanos, pithos or cyclades.

 * Move all common WizardPage variables to the base class
 * Give more sensible names to some variables
 * Make Wizard compute the title for all WizardPages

Make the cloud selection wizard page an instance of WizardMenuPage

When registring an image, use the information returned by the
kamaki register method to construct the metadata file.

When dumping the image to the local filesystem, store the image
properties and the disk-format info in the metadata file.

 * Change the authentication everywhere to use clouds
   (authentication URL and token pairs)
 * Add menu entries to manage clouds
 * Add an extra -a option in snf-image-creator to allow the user to
   specify authentication URLs

 * Prefix all private methods with _
 * Write missing docstrings
 * Move all public methods above the private ones
 * Add module docstrings where missing
 * Define source code encodings on all modules

If the image gets registered as public allow anyone to read the
metadata and the md5sum file.

Check if the filesystem is mounted read-write before you execute
the do_sysprep function

Rename DiskDevice class to Image and move it to a seperate module.
Also, don't let the user access the os_type/* modules directly. In
Image class create the `os' member variable that will host an
appropriate instance of one of the OSBase classes.

Variable d in function valideate_account was undefined

Support images that can only be deployed by the user that registers
the image to cyclades

You don't need the account name. You can fetch it from astakos using
the authentication token.

Latest versions of synnefo require user id instead of e-mail to
authenticate.

The program would crash when running in wizard mode if the account
or token where missing from the .kamakirc file.

Create a new dialog_menu module to host all the "expert mode" code.
Check the code with a new version of pep8

Fix various typos in messages, add .gitignore file for
automatically produced intermediate files.

Logging can be enabled using the -l input option

After the image has been uploaded to pithos and registered to cyclades,
prompt the user about saving the uploaded image locally.

This exception can be used by the WizardPage instances to exit the
wizard.

Make the ImageDescription field of the dialog wizard overwrite the
DESCRIPTION image property.

In the cli output classes this method will clear terminal screen if
the standard output is a terminal.

A user can now create and upload an image using the wizard

The system does not perform anything yet when in wizard mode.

Create the new python module to host the aforementioned code.