讲活动限制设置修改为输入框
主页活动限制输入提示优化；
修过证书显示页面;
Merge branch 'dev' of https://github.com/HCI-webdesigner/Dean into hci_biao

Conflicts:
	app/views/Activitys/showActivitys.html
实现系统参数修改功能
修复修改系统参数后台页面底部点保存后有变化
Merge branch 'hci_biao' of https://github.com/HCI-webdesigner/Dean into leaf

4月8号合并

Conflicts:
	app/controllers/Application.java
	app/views/Activitys/showActivitys.html
	app/views/Certificates/certificateOne.html