Add option to enable service fixes #42
Allow better control of service enabling

Change-Id: Ia57ea704b22199b9bdd788ab13f7753b50ba5f59
diff --git a/nginx/server.sls b/nginx/server.sls
index 0d6a6fe..763e928 100644
--- a/nginx/server.sls
+++ b/nginx/server.sls
@@ -106,6 +106,9 @@
   - name: {{ server.service }}
   - require:
     - pkg: nginx_packages
+{%- if server.service_enable is defined %}
+  - enable: {{ server.service_enable }}
+{%- endif %}
 
 {%- set generate_dhparams = { 'enabled': False } %}
 {%- for site_name, site in server.get('site', {}).iteritems() %}