add kaminari
merge master
add user email validate spec
add file upload controller spec
rm public/test
update gitignore
完成分段上传js基本逻辑
update upload javascript
add MediaResource#size
add some methods to MediaResource
完成资源文件删除逻辑
update css
完成网盘基础逻辑
merge master, 增加网盘功能