add support for events { use <epoll,etc>}

nginx/templates/config.jinja

@@ -14,6 +14,10 @@ daemon {{ nginx.get('daemon', 'off') }};
 
 events {
     worker_connections {{ nginx.get('events', {}).get('worker_connections', 1024) }};
+    {% set use = nginx.get('events', {}).get('use', '') %}
+    {% if use %}
+    use {{ use }};
+    {% endif %}}
 }
 
 http {