update threading
Updated the runreef powershell script
Updated the powershell launch script with command line options and help. It can nw also be used as a library.
Merge remote-tracking branch 'origin/master'

Conflicts:
	bin/runreef.ps1
Updated the launch script for Windows Server 2012
Merge pull request #670 from Microsoft-CISL/sync_evaluator_manager

Update multi-threading support for Evaluator event handling
Merge branch 'master' of github.com:Microsoft-CISL/REEF into sergiym_rename_task

Conflicts:
	reef-common/src/main/java/com/microsoft/reef/runtime/common/driver/EvaluatorManager.java