课程格子排版

Signed-off-by: sopping_asus <funcsu@gmail.com>
Merge branch 'master' of https://github.com/sopping/bootstrap.git

Conflicts:
	practicalTraining/layout.css
	practicalTraining/practicalTraining.html
更新测试

Signed-off-by: sopping_asus <funcsu@gmail.com>