Note de release version 4.0.0

Solum 4.0.0 version release. This release includes implementation of the app and workflow API resources with their connection to end-to-end app deployment experience.

Specific feature include:

• App resource and app data format to represent an app

• Workflow resource to represent invocation of app deployment

• Logs resource and abstraction associated with workflow resource to represent app deployment logs

• App and workflow commands available in python-solumclient

• Improved output of languagepack list command by adding created_at attribute