Remove Failure category from passing test cases

Some of the test cases marked as Failure have started passing. Need to
ensure that these testcases are run on a regular basis.
Merge pull request #2421 from Benglin/Revit2015

Cross merge PR #2419 from "master" into "Revit2015"
Wrong category was removed

Intended to remove Failure category instead of UnitTests category.
Merge pull request #2422 from Conceptual-Design/TestCatagorization

Remove Failure category from 22 passing test cases
Folded "DynamoViewModel.Exit" into "updateManager_ShutdownRequested"
Do not use CurveLoop in RevitGeometryFromMirrorData method
Merge pull request #2432 from pboyer/Revit2015VizFix

Do not use CurveLoop in RevitGeometryFromMirrorData method
marked bad list test as failure
Fix to handle longest lacing on empty arrays

It used to crash, it now doesn't execute the function

http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4566
RecordedTest/CodeBlockNodeTest do not need to "shutdown the host"
Removed unwanted argument from "DynamoModel.ShutDown" method
Updated signature of "ShutdownRequestedEventHandler" delegate
Merge pull request #2436 from Benglin/MinorCleanUp

Clean-up of DynamoModel.ShutDown methods
Merge pull request #2435 from DynamoDS/LongestLacingFix

Fix to handle longest lacing on empty arrays
Fix to handle longest lacing on empty arrays

It used to crash, it now doesn't execute the function

http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4566
Merge pull request #2437 from junmendoza/Revit2015

Fix to handle longest lacing on empty arrays
Increase reference count for array elements
Merge pull request #2440 from ke-yu/fix_memory_corruption

Increase reference count for array elements
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into Revit2015