实现继续投票功能
refine wechat share
refine link to rank
Merge branch 'master' into yaoyiyao

Conflicts:
	assets/js/require.config.js
	students/front_urls.py
new html for lottery
add link to lottery
实现刮奖效果
完成检验是否刮开奖项的功能
refine lottery
refine lottery