Add CentOS CR repository and install epel from official packages.

puppet/modules/buildtools/manifests/repos.pp

 class repos {
-	# missing repositories elgis & epel
+	# CR repository
+	package { 'centos-release-cr':
+		ensure		=> 'installed'
+	}
+	# missing repositories elgis, epel, &eox
 	package { 'epel-release':
-		provider	=> 'rpm',
-		ensure		=> 'installed',
-		source		=> 'http://fedora.aau.at/epel/6/i386/epel-release-6-8.noarch.rpm'
+		ensure		=> 'installed'
 	}
 	package { 'elgis-release':
 		provider	=> 'rpm',
@@ -16,18 +18,18 @@ class repos {
 		source		=> 'http://yum.packages.eox.at/el/6/stable/noarch/eox-release-6-2.noarch.rpm'
 	}
 
-	$yfmcnf="/etc/yum/pluginconf.d/fastestmirror.conf" 
+	$yfmcnf="/etc/yum/pluginconf.d/fastestmirror.conf"
 
-	exec{ 'exclude_tuwien' : 
+	exec{ 'exclude_tuwien' :
 		command 	=> "/bin/ex -c '/^exclude:/d' -c wq ${yfmcnf} ; /bin/sh -c 'echo exclude: gd.tuwien.ac.at >> ${yfmcnf}'",
 		before 		=> Exec['yum_clean']
-	} 
+	}
 
 	exec { 'yum_clean':
 		command		=> '/usr/bin/yum clean all ; /usr/bin/yum makecache',
 		refreshonly	=> true,
 		subscribe	=> [
-			Package['epel-release'], 
+			Package['epel-release'],
 			Package['elgis-release'],
 			Package['eox-release']
 		]