[COOK-4411] - Add newling to iptables.snat

Signed-off-by: Sean OMeara <someara@opscode.com>
updating CHANGELOG format for stove
Version bump to 0.12.2
Publish 0.12.2 Changelog
Version bump to 0.12.3 (for development)
[COOK-3927] Substitute Perl version of rebuild-iptables with Ruby version

Signed-off-by: Sean OMeara <someara@opscode.com>
Version bump to 0.13.0
Publish 0.13.0 Changelog
Version bump to 0.13.1 (for development)
Remove unused old perl script from files/