add Chat func
Merge branch 'master' of https://github.com/yangsj/WordSpell

Conflicts:
	bin/WordsSpell.swf
	bin/assets/ui_chat.swf
	res/assets/ui_chat.fla
	src/app/modules/chat/event/ChatEvent.as
	src/app/modules/chat/model/ChatModel.as
	src/app/modules/chat/model/ChatVo.as
	src/app/modules/chat/view/ChatMediator.as
	src/app/modules/chat/view/ChatView.as