update docs to v6
add docs/gist/rsf.go
update docs
update docs
fix unit test
Merge branch 'develop' of github.com:qiniu/api into feature/update_docs
update docs
update docs
update docs
init
update demo code
update demo code
update demo code
update demo code
update demo code
update demo code
update demo code
update demo code
update demo code
update demo code