Issue LIBCLOUD-493: Add extra instance properties that now exist in the
2013-10-15 version of the EC2 API into the Node.extra dictionary. The updates
include block device mapping, VPC information and root device information
among other. All unit tests were updated accordingly and the fixture has
been updated with a more recent XML response.

Closes #221.

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