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