The respective bucket needs to be configured with a domain alias. When a
new alias is added to the `s3_web_domains` config, a new nginx site can
then be deployed to the `nginx_proxy` hosts.
Users can log in using their LDAP account (in the
ou=users,dc=kosmos,dc=org group and with the wiki attribute set to
enabled)
Add an attribute for the ldap master server, so it can be overridden in
the development environment
Refs #107
