Specify AWS SDK version in readme
Allow for no arg constructors

Also allows for constructor-less classes in bean-instance.
Update to aws sdk 1.7.6

Now generates separate bean namespaces, and can handle classes with no
constructors, which have static methods to return instances.
Remove common keys from request object arglists

Removes the :dry-run-request and :request-metric-collector keys from the arglist
Fix glacier, sqs, autoscaling and rds