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

Passed as a command line flag to DynamoWebServer
Hi @pavel,

Is this just a technique to check whether Dynamo is up and running or not?  It looks like this could be invoked multiple times if the Dynamo code was modified to support multiple sockets. Is there a better way to determine the availability of Dynamo (i.e. without mutating DynamoWebServer state)?

~Peter