Merge pull request #793 from reitermarkus/refactoring-pathname

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

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

Library/Homebrew/cask/lib/hbc/extend/pathname.rb

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

Library/Homebrew/cask/spec/spec_helper.rb

Library/Homebrew/cask/test/cask/installer_test.rb

Library/Homebrew/cask/test/support/Casks/container-gzip.rb

Library/Homebrew/cask/test/test_helper.rb

Library/Homebrew/extend/pathname.rb