Added missing libs...

Json.Net and xUnit were missing from the repo resulting in a sln unfit
to be compiled successfully right after forking.
Queue name can now be specified in code...

The queue name can now be passed to Client.Queue<T>(). This decouples
producer and consumer further. They don´t depend on the same message
types anymore. And there is no limitation anymore on how many queue
names can be specified explicitly (in App.config).