Introduce an ansible_version dict as runner variable

  Given the version:
    "1.6 (ansible_version_var 14499e8bf3) last updated 2014/03/21 17:07:50 (GMT +200)"

  We get the special variable:
    "ansible_version": {
        "full": "1.6",
        "major": 1,
        "minor": 6,
        "revision": 0,
        "string": "1.6 (ansible_version_var 14499e8bf3) last updated 2014/03/21 17:07:50 (GMT +200)"
       }

	modified:   lib/ansible/playbook/__init__.py
	modified:   lib/ansible/runner/__init__.py
	modified:   lib/ansible/utils/__init__.py
Merge pull request #6619 from sergevanginderachter/ansible_version_var

Introduce an ansible_version dict as runner variable