Fixed typo in storage.base.Object docstring.

Closes #263

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Support deletion and deprecation of GCE's images.

Add a new class GCENodeImage to represent GCE's images, and support the
`delete` and `deprecated` functions.

Added a new extra field to the image object to specify the deprecation
status.

Closes #260

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Update CHANGES.
Add method `ex_copy_image` to the GCE driver.

The `ex_copy_image` method allow to copy an image from a Google Cloud
Storage URL in the specified project.

Closes #258

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Update CHANGES.
Updated documentation for HP Cloud

Closes #262

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Fixed the documented return type. This function doesn't return a value.

Closes #265

Signed-off-by: Tomaz Muraus <tomaz@apache.org>