Foreman » Installer

Rename loadyaml to loadanyyaml to prevent stdlib conflict

Throw error when YAML type is unknown

Change YAML path to /etc/foreman-proxy/answers.yaml for consistency
Parameterise foreman_installer class for answers.yaml location

Reapply YAML in develop branch

Revert "Installation via a yaml file." - moving this to a develop branch

This reverts commit 84a9a25f7ea7b74a3b11c3959c09bb247ad1f1e4.

Installation via a yaml file.
This can be written by a configuration script
Can be stashed in /etc for reference / re-use
Update README to use new style install