修改manager.html中左侧导航的权限
把SessionManager改为utils，修改课程学习时候课程信息显示的css
添加课程信息查看页面
添加课程信息查看页面
修复
Merge branch 'leaf' of https://github.com/HCI-webdesigner/Dean into leaf

fixed the confict

Conflicts:
	app/controllers/Examinations.java
	app/views/Application/base.html
	app/views/Studyings/showResourceComment.html
	app/views/Studyings/showStudyResource.html
	app/views/manager.html
修复manager.html
修复了manager.html