use Origins-Pattern instead Allowed-Origins

this is the new default config of unattended-upgrades package in Debian.
added other variables for Unattended-Upgrade options
Merge pull request #2 from LibreIT/master

use Origins-Pattern instead Allowed-Origins
Update main template using Wheezy version
Setup Travis-CI tests

Via
https://servercheck.in/blog/testing-ansible-roles-travis-ci-github
Move variables from defaults to vars

defaults are meant for included and dependent roles
Add Vagrant configuration
Split-up patterns configuration for Debian and Ubuntu
Update meta file
Update README with orig. patterns description