Remove per user DROP, use global DROP instead

Packets that do not find a matching rule will reach the end of the ruleset,
and get dropped by the global DROP rule.
Fix init script
Resolve FQDNs in the recipe

I've had issues where performing the DNS resolution when loading the rules
was slow. Plus, some DNS records will return multiple IP addresses, and we
want to add all of them to the firewall (not just one of them).
For these reasons, AFW will perform a full DNS resolution in the recipe, and
the ruleset will only contain IP addresses.
README cleanup
Merge branch '0.0.6'

Signed-off-by: Julien Vehent <julienv@aweber.com>
set default use_rule_comments = true
Merge branch 'add-iptables-comments' of github.com:irccloud/AFW
Bump to v0.0.6
Check for nil interface
Add support for retrieving rubydns from native OS package, or not at all
Correctly merge rules into a
Merge pull request #7 from elliotkendallUCSF/master

Support fetching dnsruby via OS package (or not at all), sanity check nil interfaces
Merge pull request #9 from dim/master

Chef 11 compatibility
Foodcritic fixes
Release v0.0.7
Remove unused recipe
Added node['afw']['disable_cleanup'] attribute support to prevent automatic rule cleanup on the chef server.
Disable cleanup attribute name changed to enable_rules_cleanup and boolean value used. Per pull request comment: https://github.com/Technicolor-Portico/AFW/commit/61aa39927ca46a24eb8c9b5a205419f6652fe3e3#commitcomment-3282978.
Merge pull request #13 from Technicolor-Portico/master

Preventing auto cleanup of the rules
libraries.core: Convert the port number to a string

Previously, when checking the port number against the regex, we
assumed that the port would always be a string.  When an integer
was passed to the check_port function it would blow up and fail
the chef-client run.

This change will convert the value passed to a string and then
attempt to run the regex against the value.

The offending value was passed like:

```ruby
AFW.create_rule(node, 'Some rule', {
  'protocol' => 'tcp',
  'direction' => 'out',
  'user' => 'some_chump',
  'destination' => '127.0.0.1',
  'dport' => 8080
})
```