S3Map is an implementation of java.util.Map (built on the Amazon S3 Library for REST
in Java) that uses Amazon S3 as its backing store.

Please see the javadoc in the distribution, or at
http://s3.amazonaws.com/s3map/javadoc/org/tiling/s3map/S3Map.html
or more details.

TODO

Possible future enhancements.

 * Make S3Map fail-fast.
 * Enhance S3Map to implement SortedMap.
 * Add logging for HTTP traffic.
