add .travis.yml to test formula

.travis.yml

@@ -0,0 +1,15 @@
+sudo: required
+language: python
+services: 
+  - docker
+
+before_install:
+  - bundle install
+
+env:
+  matrix:
+    - INSTANCE: consul-ubuntu-1404
+    - INSTANCE: consul-centos-7
+
+script:
+  - bundle exec kitchen verify ${INSTANCE}