Microsoft-CISL/REEF — pull request #949 by markusweimer (2014-08-15 23:39:56+00:00)
Title: Maintaining information on closed evaluators

Closes #763 and might help with #926

* Added a new collections of closed evaluators to `Evaluators`
* Added checks in `EvaluatorManager` to ignore messages after it is deemed closed.
* Tighter locking in `Evaluators` to squash a latent deadlock that got somewhat more probable in this branch

Additionally, this PR contains two minor changes:

* Moved `EvaluatorManager.State` to be its own class `EvaluatorState`
* More protection against slow to shutdown processes in `ProcessContainer`
* Renamed the `HelloREEFHttp` job to `HelloHTTP`