Merge pull request #347 from ideawu/dev

udpate
Merge pull request #349 from ideawu/dev

update
update README.md, add authors
Merge pull request #353 from ideawu/dev

update README.md, add authors
update
Merge pull request #355 from ideawu/dev

prevent master backend_sync pause too long
update README.md
Merge pull request #370 from ideawu/dev

update README.md
update README.md
Merge pull request #372 from ideawu/dev

update README.md
update README.md
Merge pull request #373 from ideawu/dev

update README.md
things about substr, getrange
Merge pull request #375 from ideawu/dev

things about substr, getrange
Merge pull request #376 from ideawu/master

merge