Provide options to disable commands per environment.

[jmolivas]

We can manage this by providing a new feature. Adding extra configuration to the config.yml file as an example:

  disabled:
    prod:
      modules:
        - module_name_one
        - module_name_two
      commands:
        - module:download
        - module:update
        - theme:download
        - theme:update
      namespaces:
        - generate
        - create