Merge pull request #135 from aboe76/nginx_ng_listen

change watch to listen so it will only trigger a refresh of the service at the end

nginx/ng/init.sls

 extend:
   nginx_service:
     service:
-      - watch:
+      - listen:
         - file: nginx_config
       - require:
         - file: nginx_config

nginx/ng/servers.sls

     - reload: True
     - use:
       - service: nginx_service
-    - watch:
+    - listen:
       {{ file_requisites(server_states) }}
     - require:
       {{ file_requisites(server_states) }}

nginx/ng/service.sls

       {% else %}
       - sls: nginx.ng.pkg
       {% endif %}
-    - watch:
+    - listen:
       {% if nginx.install_from_source %}
       - cmd: nginx_install
       {% else %}