Refactor and rename test classes.

Make namespaces match file and directory names.
Refactor integration test base class into RevitTestServices.
Change DynamoRevitTests to RevitIntegrationTests.
Rename IntegrationTest to SystemTest

This terminology was incorrect. These tests are full system tests.
enabled dynamo scheduler in watch image node
Merge remote-tracking branch 'origin/master' into MAGN-5124

Conflicts:
	src/DynamoRevit/DynamoRevit.cs
enabled dynamo scheduler in corenodesui
Merge pull request #2846 from DynamoDS/MAGN-5124

Refactor RevitIntegrationTests
Merge remote-tracking branch 'origin/master' into Revit2015

Conflicts:
	test/Libraries/Revit/RevitIntegrationTests/CoreTests.cs
	test/Libraries/Revit/RevitIntegrationTests/FamilyTests.cs
	test/Libraries/Revit/RevitIntegrationTests/ModelCurveTests.cs
	test/Libraries/Revit/RevitIntegrationTests/SolidTests.cs
	test/Libraries/Revit/RevitTestServices/SystemTestBase.cs
Merge branch 'Revit2015' of https://github.com/DynamoDS/Dynamo into Revit2015