解决获取公告和消息时异常bug
Merge branch 'master' of https://github.com/wanghongbo/GameCenter
Merge branch 'master' of https://github.com/wanghongbo/GameCenter
修复站内信和公告bug，原因：云数据库区分大小写，本地数据库不区分大小写，将表名统一为小写
Merge branch 'master' of https://github.com/wanghongbo/GameCenter