Constructor added to copy existing CloudWatchConfig
Fix to copy CloudWatchConfig instead of creating blank new one and
missing any properties that might have been set in the original.
Passing config to Request and ServiceMetricsCollectorSupport.
formatting
Added a dummy server to handle CloudWatch requests.
This avoid the need to have an AWS account to try out metrics and
collection using Antiope.
Refactored to allow for custom metrics.
StubSigner added