Fix namespace resolution

1. Unresolved calls must not default to any class constructor - this
regressed from a refactor submission due to inadequate tests.
2. Added namespace resolution test
3. Revert tests failure category removal from previous submission -
these tests still fail
Merge pull request #3263 from junmendoza/defectfix

Fix namespace resolution
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into Revit2015
Merge pull request #3264 from junmendoza/Revit2015

Cross merge to Revit2015