Ask @wfnuser for api.

在Login页面，未登录状态下，随便设置一个token就可以通过前端的路由验证。

此时直接在地址栏请求根路径，不需要登录即可进入group页面（以及其他页面）。

Please correct our API style.

测试活动

报名截止时间：2018/03/17 11:01
活动时间：2018/03/08 11:02 至 2018/03/09 01:02
活动地点： 测试地点
活动简介：无

See http://arkticket.tech/hooli/#/login (please logout manually if you are already signed in)
The logo should be in the center of the page.

Press 'enter' key to login or register.

Please do some research about it. If you are familiar with it, please notice me.

In group detail page.

I'm not sure about how to throw appropriate error code in express. Please do some research about restful API style standard.

Add user in the memberlist when the success callback be triggered.

Reference https://quip.com/cpSSAQqNmauB
The style is not so important in this issue, but please make it looks comfortable.

refer https://www.tuicool.com/articles/f6ZBjm

Make styles reusable and modular.