完成控制会议的图片获取、/meeting/setPage接口，增加分页数直接跳转功能
完成参与会议的图片获取功能
替换LivePPT为CloudSlides
Merge branch 'dev-cold' of github.com:FeverTeam/LivePPT-Play2 into dev-cold
Merge pull request #57 from FeverTeam/dev-iron

Dev iron
Merge pull request #59 from FeverTeam/dev

增加意见反馈/additon/feedback接口的实现及文档。
修改android客户端下载路径
完成预览PPT页面，修复页面slider不居中问题
Merge pull request #60 from FeverTeam/dev-iron

Dev iron
Merge pull request #62 from FeverTeam/dev-iron

修改聊demo PPT的配置信息。
Merge pull request #64 from FeverTeam/dev

给每个注册用户发放CloudSlides demoPPT.
Merge pull request #65 from FeverTeam/dev-cold

Dev cold
Merge pull request #67 from FeverTeam/dev

Dev