TODO

- predicate implementation
- state machine implementation
- external interface (e.g. http, xml-rpc, carrier pidgeon)
- storage of currently active tasks
	* Can likely to be something quite simple like mongodb
	* Have a unique task id
	* Have a few objects below that:
		- items
		- dependencies
		- task state
		- item state etc.
  Note: ONLY currently active tasks. anything else can be archived / dumped to
  logs once a task is complete!  (preferably as JSON or something).   If people
  want access to old task data, it would be better to have it as part of a
  seperate database rather than cluttering the design of the ephemeral data

- Replace DeprecatedDependencyMagic with a TaskDependencyManager
  This can know about internal structure of tasks, and might be able to offload
  some of the magic from TaskFactory

- Clean up many, many things