Fix error on first time deployments caused by incorrect nginx startup order

deployment/ansible-role-nginx/tasks/main.yml

 ---
 - name: install nginx
   apt: pkg=nginx state=present
-
-- name: start nginx
-  service: name=nginx state=started enabled=yes

deployment/ansible-role-sentinel/tasks/deploy.yml

@@ -70,25 +70,25 @@
 
 - name: set nginx configuration
   template: src=sentinel.nginx.j2 dest=/etc/nginx/sites-available/sentinel
-  notify: restart nginx
   register: nginx_config
 
 - name: disable default nginx configuration
   file: path=/etc/nginx/sites-enabled/default state=absent
-  notify: restart nginx
 
 - name: enable sentinel nginx configuration
   file: path=/etc/nginx/sites-enabled/sentinel src=/etc/nginx/sites-available/sentinel state=link
-  notify: restart nginx
   when: nginx_config|changed
 
+- name: start nginx
+  service: name=nginx state=started enabled=yes
+
 - name: ensure scaladoc page is up
   uri: url=http://127.0.0.1/scaladoc/index.html
 
-- name: ensure guide page is up
+- name: ensure guide page up
   uri: url=http://127.0.0.1/guide/index.html
 
-- name: wait up to 5 mins for sentinel to run on port 8080
+- name: wait sentinel startup
   wait_for: host=127.0.0.1 port=8080
 
 - name: ensure api-docs page is up