Task: Create Binder playbook

Since we have two branches in Binder now, stable/0.8.x (using ES 1.x) and qa/0.9.x (using ES 5.x), which will require to use the official Ansible role from ES, and considering that Binder can only run in PHP 5.6 in both cases; I think it's better to create a new playbook for Binder using Ubuntu Trusty and the ES Ansible role or the ES Artefactual role based on the version.