Remove .travis.yml and rename kitchen files (#108)

.travis.yml

-sudo: required
-dist: trusty
-
-addons:
-  apt:
-    sources:
-      - chef-current-trusty
-    packages:
-      - chefdk
-
-# Don't `bundle install` which takes about 1.5 mins
-install: echo "skip bundle install"
-
-branches:
-  only:
-    - master
-
-services: docker
-
-env:
-  matrix:
-  - INSTANCE=client-ubuntu-1404
-  - INSTANCE=client-ubuntu-1604
-  - INSTANCE=client-ubuntu-1804
-#  - INSTANCE=client-centos-6 # TODO: Investigate failing converge for CentOS6
-  - INSTANCE=client-centos-7
-  - INSTANCE=client-debian-8
-
-before_script:
-  - sudo iptables -L DOCKER || ( echo "DOCKER iptables chain missing" ; sudo iptables -N DOCKER )
-  - eval "$(/opt/chefdk/bin/chef shell-init bash)"
-  - /opt/chefdk/embedded/bin/chef --version
-  - /opt/chefdk/embedded/bin/cookstyle --version
-  - /opt/chefdk/embedded/bin/foodcritic --version
-
-script: KITCHEN_LOCAL_YAML=.kitchen.dokken.yml /opt/chefdk/embedded/bin/kitchen verify ${INSTANCE}
-
-matrix:
-  include:
-    - script:
-      - /opt/chefdk/bin/chef exec delivery local all
-      env: UNIT_AND_LINT=1