Added support to AWS::SQS::Queue::SentMessage for request ID.
Merge branch 'request-id' of https://github.com/bosmanx/aws-sdk-ruby into bosmanx-request-id
Added some tests and and corrected a few test errors for SQS::SentMessage#request_id
Merge branch 'bosmanx-request-id'

See #586
Fixing 1.9.2 test failure.