Initial commit for acceptance testing

Uses Kitchen-CI, kitchen-ansible and kitchen-docker components
Also uses serverspec.

Currently supports:

- CentOS 6, 7
- Debian 7, 8
- Ubuntu 14.04

test/integration/default.yml

@@ -0,0 +1,9 @@
+---
+- name: wrapper playbook for kitchen testing "elasticsearch"
+  hosts: localhost
+  roles:
+    - elasticsearch
+  vars:
+    es_plugins:
+      - plugin: lmenezes/elasticsearch-kopf
+        version: master