Issue LIBCLOUD-481: Store additional attributes (iops, tags,
block_device_mapping) in the   "extra" dictionary of the NodeImage object in
the EC2 driver.

Also fix ex_image_ids filtering in the list_images method.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Update CHANGES.
Merge pull request #19 from apache/trunk

Synchronizing fork