Add rs and fop
update README.md
Refactory
Rollback
update
Add `MakeRequest` to ImageInfo, ImageExif
Add ImageExifRet field
Add blank line
update
Merge pull request #6 from chzyer/feature/add_fop_and_rs

Feature/add fop and rs
Update README.md
Remove ImageExifRet struct and Rename ExifValType
Merge pull request #7 from chzyer/feature/fix_fop_image_exif

Remove ImageExifRet struct and Rename ExifValType
fop spec: fix
upload/download
Merge pull request #8 from xushiwei/feature/putget

upload/download spec
s
Merge pull request #9 from xushiwei/feature/putget

s
add gist manual