Corrected a test describe block tabel for clarity.
Regrouped queryparam serializer list tests as flattened and non-flat.
Updated EC2 API configuration to fix input list members.
QueryParamSerializer now observes flattened traits on lists.

EC2 now uses flattened traits on input lists, instead of
"memberedLists": false.  Removed support for membered list boolean
from the service API and serializer.

Fixes #54