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

...st/support/fixtures/cask/Casks/invalid/invalid-two-url.rb

...upport/fixtures/cask/Casks/invalid/invalid-two-version.rb

...mebrew/test/support/fixtures/cask/Casks/local-caffeine.rb

...ew/test/support/fixtures/cask/Casks/local-transmission.rb

...brew/test/support/fixtures/cask/Casks/missing-checksum.rb

...brew/test/support/fixtures/cask/Casks/missing-homepage.rb

...Homebrew/test/support/fixtures/cask/Casks/missing-name.rb

...mebrew/test/support/fixtures/cask/Casks/missing-sha256.rb

.../Homebrew/test/support/fixtures/cask/Casks/missing-url.rb

...ebrew/test/support/fixtures/cask/Casks/missing-version.rb

...brew/test/support/fixtures/cask/Casks/naked-executable.rb

...y/Homebrew/test/support/fixtures/cask/Casks/nested-app.rb

.../Homebrew/test/support/fixtures/cask/Casks/no-checksum.rb

...mebrew/test/support/fixtures/cask/Casks/no-dsl-version.rb

...st/support/fixtures/cask/Casks/osdn-correct-url-format.rb

.../support/fixtures/cask/Casks/osdn-incorrect-url-format.rb

...st/support/fixtures/cask/Casks/sha256-for-empty-string.rb

...ort/fixtures/cask/Casks/sourceforge-correct-url-format.rb

...t/fixtures/cask/Casks/sourceforge-incorrect-url-format.rb

...sk/Casks/sourceforge-version-latest-correct-url-format.rb