Added support for allow_ssh_root_user, scriptwhitelist, allowhiddendir, and allowhiddenfile.

Added support for allow_ssh_root_user, scriptwhitelist, allowhiddendir, and allowhiddenfile. To accomodate this, rkhunter.conf had to become a template. 

I also made the default settings consistent with the documentation and switched to actual booleans. And I made the capitalization in the README more consistent while updating it to show the new options.