Roshan is a web-based administrative interface for ZooKeeper cluster.

Roshan is developed with Django and Ext-js.

What i do here is add a support for digset.


Roshan是一个管理zookeeper集群的系统，这里主要是添加了下对digest功能的支持

其他见原repo


```
python
>>> import hashlib
>>> print hashlib.sha1('user:password').digest().encode('base64')
tpUq/4Pn5A64fVZyQ0gOJ8ZWqkY=
```