add some orders in the tair-rdb shell by zbcwilliam 
the added orders are: zadd, zrem, zrange, zrangebyscore, zcard, scard;

Tair is a distributed key-value storage system originally developed at Taobao.com.

* features:

 - simple client configuration thanks to lightweight config server
 - items are versioned to avoid data inconsistencies due to concurrent update
 - supprt for atomic counter 
 - support for pluggable storage engine
 - data is automatically partitioned and replicated over whole cluster
 - server failure is handled transparently

* get and deploy tair

see: http://code.taobao.org/trac/tair/wiki/ZhWikiStart 

* Contribution

The source code is available user the GPL version 2. We are avtively looking for contributors so if you have any ideas, bug reports, or patchs you would like to contribute please do not hesitate to do so.