117: Added S3 Access Role.

This should allow the stack to fetch prod backups from S3 with no embedded
creds.
117: Prod backups require prod like size.
117: Allow the capability to add a Role.
117: RolePolicyDocument, not just PolicyDocument.

Learn to type.

:pear: @3000
108: Stack fetches prod backup itself.

:pear: @3000