fusor - initial installer
fusor - install staypuft package

For now, the fusor installer will install the staypuft package.
This will likely change in the future to be fusor or possibly other
packages.
fusor - update to use katello-installer as the base
fusor - remove firewall module, since it is provided with the katello-installer
fusor - removing wizards/seeders that can may be better handled from the UI

Note: if we find that these are necessary within the installer, we'll need
to adapt them to support organizations.
fusor - rename foreman_proxy as capsule, as that is what is used by katello
fusor - additional firewall rules
fusor - update the README

Updating the README to remove staypuft details.  All of the "TODO"
comments will be addressed as we have more details on the installation
of fusor available.