Version 0.9.13

It's been a while and a lot has changed.

• Add support for pre and post hooks in fwfire script.
• Updated helpers (changes to existing helpers, additional new helpers).
• Rename fire script to fwfire to avoid conflict with other projects with a fire tool.
• Deprecation Warning: The % sigil is not longer valid to use a variable. Use the $ sigil instead (like bash, perl, php etc)
• Add ignore_multicast option to bypass multicast packets being checked in the anti-spoof checks.
• Clean up of documentation and examples.
• Some code refactoring and clean up
• Bug fixes of course.