Merge pull request #2 from longshenzhu/master

首页重写
creat_group
单元测试未遂
Merge pull request #3 from longshenzhu/master

广播页修改
增加登陆和注册的表单验证
增加登陆和注册的表单验证
各模块model重写
Merge branch 'master' of https://github.com/longshenzhu/COC into longshenzhu-master

Conflicts:
	demo_COC/accounts/forms.py
	demo_COC/accounts/models.py
	demo_COC/media/img/student/9/face.jpg
	demo_COC/templates/group/group.html
	demo_COC/templates/group/group_base.html
	demo_COC/templates/group/group_topic.html
before merge conflict
Merge branch 'longshenzhu-master'
after merge
Merge branch 'master' of https://github.com/lcya86/COC