REACH-59 Don't show Dynamo UI when starting node-webkit mode 

Passed as a command line flag to DynamoWebServer
Peter, yes, you are correct, this is to determine whether Dynamo is up and running. I spent a descent amount of time on this, but didn't find a better way to do this. 
Not sure that problem you mentioned can be resolved at the moment in a proper way, because we are not confident in how multi-user environment will be implemented. Maybe lets keep it as is, and solve the problem as it comes?