Feature/chained add input

[arnos]

Changes for:

• Allow to name input ports for input streams
• Make the addInput(...) and addHook(...) methods chainable
• Existing Tests modified to reflect the change

To allow the following:

    network.addWorker("TestReceiver", TestReceiver.class.getName())
           .addInput("Counter")
           .addHook(null)
           .addInput("Counter2","OUT","IN");