Add support for Gentoo to nginx.ng

FORMULA

@@ -1,6 +1,6 @@
 name: nginx
-os: RedHat, Debian, Ubuntu, Suse
-os_family: RedHat, Debian, Suse
+os: RedHat, Debian, Ubuntu, Suse, Gentoo
+os_family: RedHat, Debian, Suse, Gentoo
 version: 201507
 release: 1
 minimum_version: 2015.8

nginx/ng/map.jinja

@@ -46,6 +46,15 @@
             'vhost_enabled': '/etc/nginx/sites-enabled',
             'vhost_use_symlink': True,
         },
+        'Gentoo': {
+            'package': 'www-servers/nginx',
+            'service': 'nginx',
+            'webuser': 'nginx',
+            'conf_file': '/etc/nginx/nginx.conf',
+            'vhost_available': '/etc/nginx/sites-available',
+            'vhost_enabled': '/etc/nginx/sites-enabled',
+            'vhost_use_symlink': True,
+        },
     }, default='Debian' ),
     'install_from_source': False,
     'install_from_ppa': False,