Updates README with AWS server info
Upgrades Ruby version on servers

Due to readline compatibility issue in 2.1.1
See https://bugs.ruby-lang.org/issues/9578
Configures Ansible with EC2 servers, and create host configs

Moves the config for hosts in to specific host files (such as hostname).

Also adds an `ansible.cfg` file to fix the Control Path for EC2 servers
(SSH has a limit on control path length, and EC2 hostnames aren't ideal
for that). See http://docs.ansible.com/intro_configuration.html#control-path
Improves reliability of Ruby ansible install command
Adds an Ansible role for setting up a deploy user
Moves README info out in to docs folder

Hoping to start getting a better handle on docs before the project gets
bigger :-)