Add to documentation, installing ansible to ubuntu 14.04

[antonyanimator]

sudo apt-add-repository -y ppa:ansible/ansible sudo apt-get update sudo apt-get install -y ansible

[philipnorton42]

Done.

[dixhuit]

I think we should just link to the relevant page of the Ansible docs for installation instructions. Responsibility for updating instructions is then handed off to Ansible themselves.

http://docs.ansible.com/intro_installation.html