Add `:cask` to all Cask specs.

Move Cask test helpers to `test/support`.

Remove `dev-cmd/tests.rb` from test coverage.

Use `described_class` in `Tap` spec.

Silence `cmd/cask` test.

Use `Gem.bindir` instead of `#{Gem.dir}/bin`.

java_requirement: don't consider macOS Java stub

Don't check Subversion HTTPS pre-Sierra.

Add exceptions for node@* versioned formulae to use conflicts_with
instead of keg_only :versioned_formula since they, and the main node
formula, all currently overwrite npm during postinstall.

The system Subversion doesn't handle new certificate authorities (e.g.
Let's Encrypt) well enough for this check to be useful.

Update Cask `spec_helper`.

Move Cask `shared_examples` to `test/support`.

Make Cask tests work without tapping `caskroom/cask`.

Move Formatter and Locale specs.

Merge Plist spec with SystemCommand::Result spec.

Don't list duplicate dylibs for universal

audit: reject versions starting with HEAD

README: Switch to https:// links

Many parts of Homebrew assume that a version string beginning with
"HEAD" is, in fact, a head build. A stable version that begins with
"HEAD" violates this assumption and causes problems, as it's treated
as a head build in some places and as a stable build in others.

Update `.bundle/config`.