Merge pull request #2232 from reitermarkus/spec-mktmpdir

Library/Homebrew/test/cmd/bundle_spec.rb

Library/Homebrew/test/cmd/commands_spec.rb

Library/Homebrew/test/cmd/custom-external-command_spec.rb

Library/Homebrew/test/cmd/linkapps_spec.rb

Library/Homebrew/test/cmd/unlinkapps_spec.rb

Library/Homebrew/test/cmd/unpack_spec.rb

Library/Homebrew/test/dev-cmd/audit_spec.rb

Library/Homebrew/test/diagnostic_spec.rb

Library/Homebrew/test/gpg2_requirement_spec.rb

Library/Homebrew/test/gpg_spec.rb

Library/Homebrew/test/java_requirement_spec.rb

Library/Homebrew/test/language/go_spec.rb

Library/Homebrew/test/language/python_spec.rb

Library/Homebrew/test/os/mac/java_requirement_spec.rb

Library/Homebrew/test/pathname_spec.rb

Library/Homebrew/test/sandbox_spec.rb

Library/Homebrew/test/spec_helper.rb

Library/Homebrew/test/support/helper/mktmpdir.rb

Library/Homebrew/test/utils_spec.rb