Added services for AclAwareAmazonS3 Gaufrette Adapter

To use ACL on AWS S3, you need to use the AclAwareAmazonS3 adapter instead of the AmazonS3 one.

I've added missing services on MediaBundle, but it remains to integrate ACL management. When using this new adapter, new files will be private (see http://docs.amazonwebservices.com/AmazonS3/latest/dev/ACLOverview.html#CannedACL for more information).