Add some server settings

 - elasticsearch_transport_tcp_port
 - elasticsearch_discovery_zen_ping_multicast_enabled
 - elasticsearch_discovery_zen_ping_unicast_hosts
 - rest_enable_cors
Merge pull request #2 from Jimdo/add_some_settings_squashed

Add some server settings
Merge branch 'master' into migration_0.20.2

Conflicts:
	manifests/server.pp
	manifests/server/configure.pp
	templates/server.conf.erb