Improve Cache Control/Expires support

Presently the portable abstraction exposes cache control/expires support via PayloadBlobBuilder.expires for S3 single-part uploads only. jclouds should expand support for more providers:

• Atmos - not supported in 2.1 API
• Azure - supported via x-ms-blob-cache-control header: https://msdn.microsoft.com/en-us/library/azure/ee691966.aspx
• Google Cloud Storage - supported via Cache-Control header: https://cloud.google.com/storage/docs/reference-headers#cachecontrol
• S3 - supported via Cache-Control header: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html
• Swift - not supported: http://stackoverflow.com/questions/30622290/openstack-swift-add-cache-control-and-expires-headers