大部分实现,没加@限制,而且模板硬编码
去掉模板硬编码，单独写一套学生看的课程及实验信息 lesson_infomation_for_student  experiment_infomation_for_student
添加修饰,添加异常捕获
修改模板显示内容
修改命名及去掉不必要的代码
代码对齐
修改代码风格
删除无用的文件
Merge branch 'feature/student_select' into develop

Conflicts:
	OEMS/urls.py
	experiment/models.py
	student/models.py
	student/views.py
	templates/student/_nav_bar.html
	templates/student/_side_bar.html
Merge branch 'develop' into feature/design_web_page

Conflicts:
	experiment/models.py
	student/views.py