完成了登陆，首页的功能，以及主从数据库架构，尚未作错误处理
Merge branch 'master' of https://github.com/ss098/BreadCARE into ss098-master

Conflicts:
	handlers/index.py
	routes.py
	settings.py
	templates/base.html
	templates/index.html
Merge branch 'ss098-master'