Merge pull request #114 from M2Mobi/centos

Add lookup index for CentOS

nginx/ng/map.jinja

             'vhost_use_symlink': True,
             'pid_file': '/run/nginx.pid',
         },
+        'CentOS': {
+            'package': 'nginx',
+            'service': 'nginx',
+            'webuser': 'nginx',
+            'conf_file': '/etc/nginx/nginx.conf',
+            'vhost_available': '/etc/nginx/conf.d',
+            'vhost_enabled': '/etc/nginx/conf.d',
+            'vhost_use_symlink': False,
+            'pid_file': '/run/nginx.pid',
+            'rh_os_releasever': '$releasever',
+            'gpg_check': False,
+            'gpg_key': 'http://nginx.org/keys/nginx_signing.key',
+        },
         'RedHat': {
             'package': 'nginx',
             'service': 'nginx',