Microsoft-CISL/REEF — pull request #746 by markusweimer (2014-04-02 17:16:16+00:00)
Title: Small refactorings to EvaluatorManager

* Introduced the new class `EvaluatorMessageDispatcher` that deals with all messages to the user code.
* Added a new configuration option that sets the number of threads used in `EvaluatorMessageDispatcher`

Note that I changed the default number of threads to 4 from 16. Given that we instantiate one of these per Evaluator, 16 seemed a bit excessive