added watch object handling for Revit
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into MVVM

Conflicts:
	src/DynamoCore/ViewModels/DynamoViewModel.cs
	src/DynamoRevit/ViewModel/RevitWatchHandler.cs
Merge pull request #2124 from Steell/revit-watch-fix

Fixed watch node on top of Revit: MAGN-4102