Fix minor documentation issue causing major headache

1) The previous form of the files declation had no effect
   with current grunt and lead to a hangup (because the loop is empty).

2) Add empty multi-task to enable task
   Newer grunts report "Warning: Task
      "stop_node" failed. Use --force to continue."
   if the configuration does not contain a multi-section entry.
Merge pull request #1 from bentolor/fix/doc

Fix minor documentation issue causing major headache