Fix MAGN-4015 Can not create a level is there is already a level with the same name
Added test cases for the level nodes
Move GetAllLevels to the utility class
Simplify the utility class
Merge pull request #2605 from pboyer/OutputString

Show name on Output node
Synced LibG DLLs to latest
Merge pull request #2621 from DynamoDS/Intellisense

First phase of Code block Auto-completion for merge into master
Merge pull request #2591 from Randy-Ma/magn-4015

Fix MAGN-4015 Can not create a level is there is already a level with th...
Merge branch 'master' into Revit2015