完成了CourseInfoLogic的逻辑
Merge branch 'master' of
https://github.com/NJU-HouseWang/nju-eas-server.git

Conflicts:
	src/main/java/NJU/HouseWang/nju_eas_server/SystemFactory/SystemFactory.java
	src/main/java/NJU/HouseWang/nju_eas_server/logic/CourseInfoLogic.java
	src/main/java/NJU/HouseWang/nju_eas_server/logic/CourseSelectionLogic.java
	src/main/java/NJU/HouseWang/nju_eas_server/logic/MessageLogic.java
	src/main/java/NJU/HouseWang/nju_eas_server/logic/TeachingPlanLogic.java