Release Notes:

RightScale::SdbInterface & ::ActiveSdb have several enhancements, including:
- RightAws::SdbInterface#last_query_expression added for debug puposes
- RightAws::ActiveSdb::Base#query :order and :auto_load options added to support query
result sorting and attributes auto loading
- RightAws::ActiveSdb::Base#find_all_by_ and find_by_ helpers improved to support
:order, :auto_load, :limit and :next_token options
- RightAws::SdbInterface#delete_attributes bug fixed
- SdbInterface allows specification of a string value to use for
representing Ruby nil in SDB.
- Sdb tests fixed and improved

The ::S3 interface now has support for S3's server access logging.
Amazon considers server access logging to be a beta or provisional feature.