Added support for RHEL and did some syntax cleaning

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

git/manifests/init.pp

@@ -4,7 +4,7 @@
 class git::client {
 
     package { "git":
-        name   => $operatingsystem ? {
+        name   => $::operatingsystem ? {
             "ubuntu" => "git-core",
             default  => "git",
         },
@@ -79,8 +79,8 @@ class git::daemon inherits git::server {
                      Package["git-daemon"] ],
     }
 
-    case $operatingsystem {
-        "centos","fedora": {
+    case $::operatingsystem {
+        "centos","redhat","fedora": {
             file { "/var/lib/git":
                 ensure  => link,
                 force   => true,