added DataStax driver support for get and composite get

added DataStax java driver support for get and composite get, update and delete on the way. 

![screen shot 2013-06-13 at 2 41 48 pm](https://f.cloud.github.com/assets/957943/648073/8b71b9c2-d41e-11e2-8312-efaef305318f.png)
![screen shot 2013-06-13 at 2 42 17 pm](https://f.cloud.github.com/assets/957943/648074/8b8bd8e8-d41e-11e2-8249-78756c4ae9c6.png)
![screen shot 2013-06-13 at 2 43 43 pm](https://f.cloud.github.com/assets/957943/648075/8ba44504-d41e-11e2-9c1b-1e3b7e0eb06d.png)