Small changes for running metafora

Just a few tiny tweaks I made to run metafora. Some of these should probably be better implemented, but I didn't want to lose the things I needed to change.

* Block on unimplemented command channel
* Use file rather than dir for owner node
* Ignore possible owner nodes
it would be a funny gotcha.   Since tasks should be created with our own Client **only**, we could prefix tasks with ```task:``` and filter out anything that doesn't start with our prefix.