tidy up docs, change email in dockerfiles

fix broken /etc/dockersand.hosts entries, improve docs

first complete set of docs

regenerated new host keys, configured ubuntu image

added ssh-dss algorithm to ssh config stanza

use centos7 as default docker image

renamed throughout for consistency, built out full ansible process including network start/stop

documented file sharing

added framework for ansible tooling

add dockerfile stanza to populate /etc/hosts, minor doc formatting

minor documentation clarifications

start documentation, add entries for /etc/hosts

initial commit with sanitized dockerfile build of debian image