update docs to v6
add docs/gist/rsf.go
Update CHANGELOG.md
update docs
update docs
rand key generate for rs unit test
fix unit test
fix unit test
Merge pull request #76 from wangtuanjie/feature/fix_unit_testing_bug

rand key generate for rs unit test
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