Initial version of BigMessage.
Fix doc string.
Fix some doc strings and add comments.
Fixing docstring.
Updated the Support API to current, including some previously required parameters becoming optional.
Delete S3 object first, then SQS message.  Raise an exception if unable to decode s3_url.
Merge pull request #1917 from garnaat/big-message

Initial version of BigMessage.
Fixed an erroneously failing auth test.
Merge branch 'support-update' into develop