Cross merging missing files from "Vizcheduler" branch
Updated "DynamoCore.csproj" to include the two new async task files
Merge pull request #2662 from Benglin/Revit2015

Cross merging master changes into Revit 2015
Merge branch 'Revit2015' of https://github.com/DynamoDS/Dynamo into Concurrent2015

Conflicts:
	src/DynamoCore/Nodes/Watch.cs
	src/Libraries/DynamoWatch3D/dynWatch3D.cs