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.
Fixed trailing space!
Merge branch 'trunk' of https://git-wip-us.apache.org/repos/asf/libcloud into trunk