Added Failure categoy to Revit Tests.

There are few tests failing from thsi project so as requested by Monika, adding Failure category to those test cases, so that we will get a clean Results on EC.
Merge branch 'master' into Revit2015
Merge pull request #2292 from riteshchandawar/AddFailureToRevitTests

Added Failure category to Revit Tests.
Merge remote-tracking branch 'origin/master' into Revit2015
Merge branch 'Revit2015' of https://github.com/DynamoDS/Dynamo into Revit2015