[COOK-2281] postfix aliases uses require_recipe statement yet, should be include_recipe.
Merge pull request #19 from higanworks-cookbooks/FC042_require_recipe_is_deprecated

[COOK-2281] postfix aliases uses require_recipe statement yet, should be include_recipe.
release v2.1.4
update test-kitchen dep
better constrain non 1.0 test-kitchen dep
Merge branch 'master' of https://github.com/opscode-cookbooks/postfix
Several enhancements:
- Due to missing main.cf directives, some uids/gids were not
  set correctly, resulting in an either non-working or insecure
  configuration. Also added other RedHat-specific settings.
- Added IPv6 support
- The master can now also use an upstream relay host
- You can directly specify the name of the relay host, instead of
  using a search.
- Added a mechanism to add services to the master.cf file, for
  instance to add amavis support.