Adding key_suffix to redis - avoid hichecker overlap each other on restart
New redis_suffix to README.md
redis_idle_timeout and redis_max_idle as options
gofmt -s -w .
fix type mismatch for redisIdleTimeout and redisMaxIdle
Use non-pooled redis connection for subscribe, reconnecting on error

This is related to garyburd/redigo#78, there's a chance the pooled
connection will freeze when calling Close() and this would stop hchecker
from receiving further messages from the channel.