added class for redis implementation based on sorted sets and lua
scripts
added missing headers
added some basic jedis stuff
indentation
Implement Redis Sorted Set
upgrade jedis version to 2.4.2
update properties
fix bug for receive message. when c* has exception, put message back to
redis.
fix bug for peek message. not show invisible message.
Fix cache filler and peek message issue.
Code updates after review: 
1 add more unit test case. 
2 add enum
3 peek message add next handle support
4 get count only return not expired message
Merge branch 'redissortedset'