Remove Orchestrators - Merge its Functionality into Organizers

[adomokos]

The idea of Orchestrators was born when we had way too much logic in a Rails controller action. It made a lot of sense then and there, but as we used it more, we realized it just has unnecessary complexity.

I'd like to kill Orchestrators and add all its functionality to Organizers, that way an Orchestrator could be a series of Actions:

[
  FindsClientAction,
  SubmitsOrderAction,
  SendsNotificationsAction
]

or have more complex workflows:

[
  FindsClientsAction,
  iterates(:clients, [
    MarksClientInactive,
    SendsNotificationAction
   ]
]

All this work is happening in the 1.0 branch,
and it won't be backward compatible.