[COOK-3568] Fix test kitchen Gemfile

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Cleanup Gemfile and markdown formatting
Version bump to v1.2.6
Version bump to v1.2.7
Merge branch 'master' into feature/COOK-3639
COOK-3639 Suggested enhancement of php.ini template support. Revert CHANGELOG.md