Fix a regression in the paramiko SSH client which would make it not return all
the output for all the commands which exited quickly.

Part of LIBCLOUD-491.
Add a note / warning.
docs: Add some docs and example for the S3 driver.
Re-generate documentation fixtures.
Update CHANGES with 0.13.3 entry.
Issue LIBCLOUD-470: Add VPC Elastic IP support. This not only adds full EIP
support for EC2-Classic/VPC, but also adds a new ElasticIP abstraction
that will make future promotion into the base API much easier. New tests
were added to validate VPC association/disassociation/release calls work
as expected.

Closes #220.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Update CHANGES.
docs: Update code coventions section.
Re-organize methods on the EC2 driver and move extension and "private"
methods to the end.
Add __all__ to ec2 module.
Merge remote-tracking branch 'upstream/trunk' into trunk