[Modify] verify DefaultChannelHandlerInvoker.inEventLoop() logic.
[Modify] Update the relationship between EventLoop and
GlobalEventExecutor.
[Modify] nioServerChannel would create SocketChannel for every connected
client.
[Modify] save today's finding.
[Modify] add some log to trace.
[Modify] config default address and port for factorial example.
[Modify] Import Jzip for testing demo.
[Modfiy] add log to track Factorial Demo logic.
[Modify] analysis ByteToMessageDecoder class.