Permission issue on agent.conf (and server.conf)

I encountered the following error 

```

{:timestamp=>"2014-06-30T21:53:48.215000+0000", :message=>"+---------------------------------------------------------+\n| An unexpected error occurred. This is probably a bug.   |\n| You can find help with this problem in a few places:    |\n|                                                         |\n| * chat: #logstash IRC channel on freenode irc.          |\n|     IRC via the web: http://goo.gl/TI4Ro                |\n| * email: logstash-users@googlegroups.com                |\n| * bug system: https://logstash.jira.com/                |\n|                                                         |\n+---------------------------------------------------------+\nThe error reported is: \n  Permission denied - /etc/logstash/conf.d/agent.conf"}
```

This was fixed by adding the same permission settings on the configuration files as on the configuration folders.