WHY IS THIS CHANGE NEEDED?:
- TypeError raised when Tiler.dummy object was instantiated ('method'
  object is not iterable)

HOW DOES THE CHANGE SOLVE THE PROBLEM?:
- dummy_omero_metadata was a tuple of dicts, changed it to a dict.  this
  also makes available the .update() method of a dict.  and is also
  consistent with the datatype it should be in the return statement.

EVIDENCE THAT COMMIT WORKS:
- Tiler.dummy object can be instantiated from a parametes dict without
  errors

- Change the order to match tczyx where appropriate
- Make name and dimorder properties for Imagedummy