Added support for RHEL and did some syntax cleaning

Assume that "RedHat" also works where "CentOS" does.

wiki/manifests/init.pp

@@ -50,7 +50,7 @@ class wiki::moin {
         require => Util::Patch["/usr/local/src/moin"],
     }
 
-    $shared = $operatingsystem ? {
+    $shared = $::operatingsystem ? {
         "ubuntu" => "/usr/local/share/moin",
         default  => "/usr/share/moin",
     }
@@ -83,7 +83,7 @@ class wiki::graphingwiki::common {
         ensure => directory,
         mode   => "0644",
         owner  => "root",
-        group  => $operatingsystem ? {
+        group  => $::operatingsystem ? {
             "openbsd" => "wheel",
             default   => "root",
         },
@@ -364,7 +364,7 @@ class wiki::collab::base {
 
     cron { "collab-htaccess":
         ensure  => present,
-        command => $operatingsystem ? {
+        command => $::operatingsystem ? {
             ubuntu  => "/usr/local/bin/collab-htaccess",
             default => "/usr/bin/collab-htaccess",
         },
@@ -415,7 +415,7 @@ class wiki::collab::ramcache {
         dump    => "0",
         pass    => "0",
         require => File["/srv/wikis/collab/cache"],
-        before  => $operatingsystem ? {
+        before  => $::operatingsystem ? {
             "ubuntu" => Service["apache2"],
             default  => Service["httpsd"],
         },