bugfix: rpush error after ltrim(1, -1)

bugfix: rpush may not work after ltrim (1 -1)

Merge branch 'master' of https://github.com/Qihoo360/pika

rename the name of some tools and add parse_manifest tool

delete redis_version field from info

update version to 2.0.3

bugfix: rwlock didnt work for flushall and readonly

update v2.0.1

add README_CN.md link in README.md

detach AutoPurge thread to avoid run out of virtual memory