Merge pull request #3267 from reitermarkus/refactoring

Library/Homebrew/cask/lib/hbc/artifact.rb

Library/Homebrew/cask/lib/hbc/artifact/abstract_artifact.rb

...y/Homebrew/cask/lib/hbc/artifact/abstract_flight_block.rb

Library/Homebrew/cask/lib/hbc/audit.rb

Library/Homebrew/cask/lib/hbc/cli/info.rb

Library/Homebrew/cask/lib/hbc/cli/list.rb

Library/Homebrew/cask/lib/hbc/container/base.rb

Library/Homebrew/cask/lib/hbc/dsl.rb

Library/Homebrew/cask/lib/hbc/dsl/appcast.rb

Library/Homebrew/cask/lib/hbc/dsl/base.rb

Library/Homebrew/cask/lib/hbc/installer.rb

Library/Homebrew/cask/lib/hbc/staged.rb

Library/Homebrew/test/cask/artifact/alt_target_spec.rb

Library/Homebrew/test/cask/artifact/app_spec.rb

Library/Homebrew/test/cask/artifact/binary_spec.rb

Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb

Library/Homebrew/test/cask/artifact/nested_container_spec.rb

Library/Homebrew/test/cask/artifact/pkg_spec.rb

Library/Homebrew/test/cask/artifact/postflight_block_spec.rb

Library/Homebrew/test/cask/artifact/preflight_block_spec.rb