Update iis.rb

To the newer syntax to consume DSC resources.
Update resource kit to wave 6
Merge pull request #11 from smurawski/patch-1

Update iis.rb
Merge pull request #12 from Atalanta/wave-6-dsc

Update resource kit to wave 6
Add resource attribute, deprecate resource_name due to base class collision
Update README to reflect resource attribute that replaces resource_name
Fix demo recipe to use resource attribute instead of resource_name