[FEATURE] Move custom configuration into rkhunter.conf.local
[FEATURE] Add new recipe rkhunter::revert-config

This recipe reverts the original rkhunter.conf file after it has been
modified by old versions of this cookbook (< 0.1.0).

This recipe should be run once after upgrading to 0.1.0 or later.
[CLEANUP] Update metadata.rb
[FEATURE] Add custom configuration file for Ubuntu 10.04
[FEATURE] Include rkhunter::revert-config in default recipe (temp.)