Merge pull request #462 from ideawu/dev

merge dev:

Add qtrim_front, qtrim_back commands
ssdb-cli performance improved
Add export, import commands in ssdb-cli
Merge pull request #464 from ideawu/dev

do not use python with statement
Merge pull request #466 from ideawu/dev

update install script, exporter, importer
Merge pull request #467 from ideawu/dev

fix ssdb-dump bug
Merge pull request #468 from ideawu/dev

fix ssdb-cli start bug
Merge pull request #469 from ideawu/dev

export(ssdb-cli) command supports -i option
Merge pull request #473 from ideawu/dev

1.7.0.1 add qset command, rewrite Response
Merge pull request #474 from ideawu/dev

update ssdb-bench
Merge pull request #475 from ideawu/dev

fix SSDB.php bug
Merge pull request #476 from ideawu/dev

update ssdb-bench, clear bench data
Update strings.h
Merge pull request #487 from ideawu/dev

		- *incr commands return error if value cannot be converted to integer(2014-10-24)
		- Include replication/sync stats in info(2014-10-23)
		- Add set_key_range, get_key_range(for KV) command(2014-10-22)
add src/net
udpate
Merge pull request #488 from ideawu/master

master into dev