Updated fragment_main.xml
Made TextView with id 'display' scrollable.
Made the send buttom visible even in landscape view by using layout
weigth.
Updated AndroidManifest.xml.
Add permission to allow access to internet.
Updated TcpReceiverWorker.java
Add a Handler parameter to accept in constructor.
Updated TcpReceiver.java
Add a Handler parameter to accept in constructor to pass to
TcpReceiverWorker.
Updated MainActivity.java
Added a Handler to be signaled to poll uiMessageQueue.
Make Placeholder Fragment function as intended so message can still be
displayed after orientation change.