Initial work for SQS. Modified QueryVisitor to support queue attributes.
Updated integration tests for SQS.
Updated integration tests for SQS again.
Added getQueueArn method and refactored integration test again.
Updated enums for SQS.
Added some cleanup to the SQS integ tests and fixed a typo.
Fixed service description so that message attributes are correctly unmarshalled.
CS Fixes for SQS work.
Adding a "Next Release" section to the changelog to keep track of untagged changes.