missing redis operations

[costin]

Some hash operations and set/zset intersection are still not available in Redis. Issue 24 seems to add support for it. The following ops are missing: set/get/resetConfig shutdown multi/exec/watch/unwatch persist setEx get/setBit get/setRange strLen bL/bRPop linsert bRPopLPush L/RpushX zInterStore zRangeWithScore zRangeByScoreWithScore zRevRangeWithScore zUnionStore hIncrBy/hMGet/hMSet/hSet/hSetNX