make nio Server more modularization.
Add CommandListener to AttachAgent.
Add comm .WireIO class.
Add comm.ErrorCommand.java
Add comm.ExitCommand.
Add DataCommand, this extends Command.
add RetransformClassNotification.
add RetransformationStartNotification class.
Add AttachAgent#sendExit method.
add AttachAgent#sendExit methods have an arument(int code)
fix comm/ExitCommand bug.
add AttachAgent#send method
add AttachAgent import path.
fix compilation bug.
Add comm/StringMapDataCommand
fix WireIO bugs.
generating GridDataCommand now.
Add GridDataCommand, Multilineprint is remarkable!
Add OkayCommand respond to SUCCESS signal.
Add RenameCommand respond to RENAME sugnal.