[20160818013241] Native ECS Services and Bug Fixes

[ddollar]

#1081 switches over to the native AWS::ECS::Service CloudFormation handler which gives a few improvements:

• Better swaps during changes that require ECS service replacement
• CloudFormation updates are contingent on the new deployment reaching steady state

This means when you deploy new code apps will now stay in updating state until the new release actually stabilizes and will roll back if it does not.

Bug Fixes

• #1082 ECR support in all regions [@ddollar]
• #1088 Fix for UsePreviousValue in UpdateParams [@ianmalott]
• #1080 Change NoEcho to type bool in rack.json [@MiguelMoll]