Issue 123 - Integrate website cron::envrionment with Hiera

modules/web/manifests/server.pp

 class web::server(
     $vhost,
     $repository,
     $certificate = hiera('web::server::certificate', 'undef'),
     $private_key = hiera('web::server::private_key', 'undef'),
     $is_default = false,
     $aliases = undef,
     $custom_config = undef,
     $multiplexer_locations = undef,
     $geoip = false,
 ) {
 
   # Ensure there is at least one character in the respective strings;
   # see https://codereview.adblockplus.org/29329028/#msg3
   validate_re($vhost, '.+')
   validate_re($repository, '.+')
 
   File {
     owner  => 'root',
     group  => 'root',
     mode   => 0644,
   }
 
   Cron {
-    environment => ['MAILTO=admins@adblockplus.org', 'PYTHONPATH=/opt/cms:/opt/sitescripts'],
+    environment => concat(hiera('cron::environment', []), [
+      'PYTHONPATH=/opt/cms:/opt/sitescripts',
+    ]),
   }
 
   class {'nginx':
     geoip_country => $geoip ? {
       false => undef,
       default => '/usr/share/GeoIP/GeoIPv6.dat',
     },
   }
 
   class {'geoip':
@@ skipping 78 matching lines @@
     minute  => '5-55/10',
   }
 
   cron {'update_repo':
     ensure => present,
     command => "hg pull -q -R /home/www/${repository} && python -m cms.bin.generate_static_pages /home/www/${repository} /var/www/${vhost}",
     user => www,
     minute  => '*/10',
   }
 }