firewall to stop incrond being called when the firewall is run,
running the firewall...

 * Tidied postinst to make sure everything is sane
 * Added essential-icmpv6 rule

 * Now uses two classes -- one for a directory, one for a template
 * Now uses action scripts (erb) in /usr/share/.../action.d
 * Tests are completely borken

 * Firewall flushes on each invokation.
 * flush added to every invocation
 * run-parts added to end of script
 * IPv6 essential ICMP rules added
 * http rule -> http+https
 * added hanling for generic icmp rules, like 10-icmp-echo-reply

* Move bin/ruby-firewall to sbin
* Packaging improvements