Usage note about "lazy" to access node.set EBS vol id

http://help2.opscode.com/admin.php?pg=request&reqid=16455

Want to use this
https://github.com/opscode-cookbooks/aws/blob/master/providers/ebs_volume.rb#L44
as the aws_resource_tag resource_id value in a single chef-client run.
Merge branch 'master' into sh/fix-readme-tag-example