[COOK-3573] Add Test Kitchen, Specs, and Travis CI

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
[COOK-3435] Add support for RELP

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Version bump to v1.8.0
Bump devodd release
Fix rubocop warning about if conditionals
Add CI badge to README [ci skip]