Merge pull request #320 from ideawu/dev

Dev
Merge pull request #330 from ideawu/dev

Delete expireation info when deleting key
Fix zRangeByScore(redis) bug
Merge pull request #332 from ideawu/dev

Fix zRangeByScore(redis) bug
Merge pull request #336 from ideawu/dev

update ssdb-bench
Merge pull request #337 from ideawu/dev

update
Merge pull request #339 from ideawu/dev

Fix key expiration/ttl bug
Merge pull request #342 from ideawu/dev

Dev
Merge pull request #345 from ideawu/dev

update
Merge pull request #347 from ideawu/dev

udpate
Merge pull request #349 from ideawu/dev

update
Merge pull request #353 from ideawu/dev

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

prevent master backend_sync pause too long
Merge pull request #370 from ideawu/dev

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

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

update README.md
Merge pull request #375 from ideawu/dev

things about substr, getrange
Merge pull request #378 from ideawu/dev

Add hrlist, zrlist, qrlist commands
Merge pull request #394 from ideawu/dev

Dev
Merge pull request #395 from ideawu/dev

update ssdb-ins.sh