ziplist for list commands
ziplist for set
1. Add zipset, zipzset, ziphash, ziplist for set/zset/hash/list"
2. Change data encode/decode format for string/set/zset/hash/list"
3. Many performance improvement, like write performance for set, rank/range performance for zset
4. Remove 'table' related code.
5. Many other bug fix
6. Still unstable, need more tests.