Added package role

roles/packages/tests/README.md

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+# Ansible Role tests
+
+To run the test playbook(s) in this directory:
+
+  1. Install and start Docker.  
+  1. Download the test shim (see .travis.yml file for the URL) into `tests/test.sh`:  
+`wget -O tests/test.sh https://gist.github.com/brentwg/64f90bdda32a51360f71558d3171fcbb/raw/`  
+  1. Make the test shim executable: `chmod +x tests/test.sh`.  
+  1. Run (from the role's root directory) `distro=[distro] playbook=[playbook] ./tests/test.sh`  
+
+If you **don't** want the container to be automatically deleted after the test playbook is run, then add the following environment variables: `cleanup=false container_id=$(date +%s)`

roles/packages/tests/test.yml

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+---
+- hosts: all
+
+  pre_tasks:
+    - name: Update apt cache.
+      apt: update_cache=yes cache_valid_time=600
+      when: ansible_os_family == 'Debian'
+      changed_when: false
+
+  roles:
+  - role_under_test