imfreedom/ansible

Remove some old dependencies and move the mercurial dep to the role
---
- include_tasks: darwin.yml
when: ansible_facts['os_family'] == "Darwin"
- include_tasks: debian.yml
when: ansible_facts['os_family'] == "Debian"
- include_tasks: freebsd.yml
when: ansible_facts['os_family'] == "FreeBSD"
- include_tasks: openbsd.yml
when: ansible_facts['os_family'] == "OpenBSD"
- include_tasks: windows.yml
when: ansible_facts['os_family'] == "Windows"