加入隨機字串功能
新增/查詢 優惠卷功能
Merge branch 'develop' of github.com:chiuyinche/SnailHouses into develop
Add use set member discount version 1
Bugfix:
1.同一種優惠卷不重複驗證
2.不同優惠活動代碼可以相同

UI:
1.加上TAB 顯示優惠驗證
bugfix:日期格式
change to develop server mode
update to local