[WIP]collect aws cloudformation templates and stacks at Amazon refreshing

It appears that we have a history of using the AWS short name for the various service connection methods.  E.g., 

```ruby
def ec2
  ...
end
```

and 

```ruby
def sqs
  ...
end
```

I think we should have a better naming strategy here, but I can see why @bzwei chose `cfn` as the service connection name.

I guess we can stick with it, then refactor the all the service names at a later time.