Added puppetlabs-firewall (required by puppetlabs-postgresql), updated the other modules.

modules/postgresql/manifests/lib/perl.pp

@@ -0,0 +1,13 @@
+# This class installs the perl libs for postgresql. See README.md for more
+# details.
+class postgresql::lib::perl(
+  $package_name   = $postgresql::params::perl_package_name,
+  $package_ensure = 'present'
+) inherits postgresql::params {
+
+  package { 'perl-DBD-Pg':
+    ensure => $package_ensure,
+    name   => $package_name,
+  }
+
+}