[COOK-4671] Syntax Error in README

Signed-off-by: Christopher Webber <cwebber@getchef.com>
[COOK-4670] homebrew_tap provider is not idempotent

Signed-off-by: Christopher Webber <cwebber@getchef.com>
[COOK-3283] Use homebrew_owner for cask and tap

Signed-off-by: Christopher Webber <cwebber@getchef.com>
Version bump to 1.6.6
Publish 1.6.6 Changelog
Version bump to 1.6.7 (for development)