autoscaling: More complete and correct LC and ASG handling

* Correct ASG tag types, names, and application (Ref http://docs.aws.amazon.com/AutoScaling/latest/APIReference/API_TagDescription.html).

* Add a few fields to structs to better reflect the complete AWS APIs.

* Adjust `member>` handling in XML tags to correctly parse multi-item
  elements (ref #97 for a similar case).