add doc
Merge pull request #12 from rwifeng/doc

add doc
Update README.md
fix doc
add rsf
fix
fix
fix
add batch ops
mv rsf class to func
Merge pull request #16 from rwifeng/rsf

Rsf
Merge pull request #17 from rwifeng/batch

add batch ops
rsf+batch
bugfix: rsf
fix
Merge pull request #18 from xushiwei/feature/rsf_batch

rsf+batch
Merge pull request #15 from rwifeng/doc

fix doc
Update CHANGELOG.md
Merge pull request #20 from qiniu/develop

Release v6.0.2