[x] methods specific to StorageParticipant
[o] redis -> @redis
[o] update to redis-rb 2.0 (which has sthing about threads)
    http://blog.citrusbyte.com/2010/05/14/redis-rb-200/
[x] 1 ::Redis instance per thread ? (instead of :thread_safe => true)

[ ] resque participant ?
[ ] sidekiq participant ?

[ ] use flushdb