This is only needed for the info method. There is no reason to pollute
the rest of the methods with this.

By default the output goes to sys.stdout. This is used in snf-mkimage
to output the plankton answer when registering an image to a synnefo
deployment.

This resolves #21

The base class is named Output. Having a method with the same makes
the code confusing.

output is a Output class method and using it in _Progress makes the
code more confusing.

According to the decision of the GRNET Board of Directors,
switch license to GPLv3.

This commit will be propagated to the release
and master branches based on git flow, and the next
release will be licensed as GPLv3.

 * 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

This is a workaround for a progress bar bug, where the system may
stay with the cursor hidden if finish() is not called.

Add progress >= 1.0.2 as install_dependency, since this is the version
that fixed the empty progress bar problem.

Logging can be enabled using the -l input option

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

This is handy because now progress class can print using the output
methods of it's output class

If not then don't output progressbars and colors

The progress bar of the progress generator had a wrong max attribute.

All image-creator components now output messages using an instance
of one of the output classes.