jinja2 style variable access

$varialbe is old style. use {{ variable }}. this is basic form of
variable substitution.
Merge pull request #3 from troter/jinja2-style-variable-access

jinja2 style variable access
Merge pull request #1 from Kami/update_playbook_to_work_with_new_versions

Update playbook to work with new Ansible versions
Role refactor