Add example of "insanely complete" playbook

This "Insanely complete Ansible playbook, showing off all the options" is actually copied from this GitHub Gist:

https://gist.github.com/phred/2897937

All attributions should be to Fred Alger (https://gist.github.com/phred)
Merge pull request #31 from glenjarvis/feature/add_demo_playbook_iter_10

Add example of "insanely complete" playbook