Allow third parties to view files under supervisor directory logs (#100)

At the moment users such as Logstash cannot view any supervisor created logs because they do not have execute permissions on the log directory supervisor creates.

manifests/service.pp

@@ -84,7 +84,7 @@
     ensure  => $dir_ensure,
     owner   => $user,
     group   => $group,
-    mode    => '0750',
+    mode    => '0755',
     recurse => $dir_recurse,
     force   => $dir_force,
     require => File['/var/log/supervisor'],