Merge pull request #24 from DavidXArnold/master

changed databag encryption attribute value from symbol to string
Merge pull request #25 from DavidXArnold/master

Added iptables support
changed rhel default nsswitch attribute.
Merge pull request #26 from DavidXArnold/master

changed rhel default nsswitch attribute.
fixed rspec tests
Merge pull request #27 from DavidXArnold/master

fixed rspec tests
added logwatch recipe and set berksfile gem requirement to > 2.0.18
updated changelog and version
added postfix recipe to default
Merge pull request #33 from DavidXArnold/nmdbase-29

Nmdbase 29 adds updated berkshelf GEM, logwatch & postfix recipes to default.  Fixes #28 Fixes #29 Fixes #31