Redis HA Support

[roshi-bushido]

Hi, have you ever thought of supporting redis high availability features such a being able to change the redis host on runtime if the redis server crashes?
Redis addresses using Sentinel (http://redis.io/topics/sentinel), the RedisSessionManager should be able figure out if the redis server is down and automatically change the host to the promoted server (maybe by scanning a file container the current master address...)

[jcoleman]

I haven't had that need personally, but I'd certainly be open to merging in a pull request with a feature like that.

[roshi-bushido]

Owesome, as soon as i have some working i'll recheck with you before the pull request....