Error return code if nginx fails to start

Because of this:

```
 λ deploy at reploy in /etc/init.d
 → sudo service nginx start
 * Starting Nginx Server...                                                                                                                           nginx: [emerg] mkdir() "/usr/local/var/run/nginx/client_body_temp" failed (2: No such file or directory)
                                                                                                                                               [ OK ]
 λ deploy at reploy in /etc/init.d
 → echo $?
0
```

Also various orchestration tools, such as Ansible for example, that relies on exit codes shows that nginx started successful, although this is not true.