Merge pull request #301 from ideawu/dev

merge dev, add expire command
Merge pull request #302 from ideawu/dev

udpate thanks list
Merge pull request #308 from ideawu/dev

merge dev, 1.6.8.8
Merge pull request #314 from ideawu/dev

php api add hgetall
Merge pull request #316 from ideawu/dev

py,cpy api list command return array
Merge pull request #317 from ideawu/dev

Change multi_*get commands' mode to rt
update ssdb-cli
delete tools/a.php
Merge pull request #319 from ideawu/master

merge master into dev