Merge branch 'master' of https://github.com/DynamoDS/Dynamo into ShutdownSequence
Merge branch 'ShutdownSequence' into Concurrent
Refactored "Delete(KeeperId)" call into a separate static function
Refactored "PostableCommand.ExitRevit" into "ShutdownRevitHost"
Moved "DynamoRevit.DeleteKeeperElement" to the right location
Merge branch 'ShutdownSequence' into Concurrent