Update EC2 model for Reserved Instances instance type modifications
Update opsworks models for new resource management features
Merge branch 'model-updates2' into develop

* model-updates2:
  Update opsworks models for new resource management features
  Update EC2 model for Reserved Instances instance type modifications
Bump jmespath dep to 0.0.3
Bumping version to 0.19.0
Merge branch 'release-0.19.0' into develop

* release-0.19.0:
  Bumping version to 0.19.0