Fix MAGN-5027 Dynamo doesn't notice changes to levels in Revit
Move one utility function to RevitServices
Update one test case
Merge branch 'master' into magn-5027

Conflicts:
	test/Libraries/Revit/RevitIntegrationTests/ElementBindingTests.cs
Modify test cases after merge
Merge pull request #2936 from aparajit-pratap/coconutBugs

Fix for flaky excel tests
Merge pull request #2873 from Randy-Ma/magn-5027

Fix MAGN-5027 Dynamo doesn't notice changes to levels in Revit
Merge branch 'master' into Revit2015

Conflicts:
	test/Libraries/Revit/RevitIntegrationTests/ElementBindingTests.cs
Merge pull request #2950 from Randy-Ma/Revit2015

Merge the master branch to the Revit2015 branch