queue task/scheduled task added cluster params and revise priority descr...

...iption
![scheduling tasks iron io dev center](https://cloud.githubusercontent.com/assets/1712162/3820926/bc1b2a64-1d00-11e4-8815-c8f2736ecebe.png)
![ironworker rest http api iron io dev center 2014-08-05 17-28-17 2014-08-05 17-28-27](https://cloud.githubusercontent.com/assets/1712162/3820927/bd8278f8-1d00-11e4-95fe-e29236453c8a.png)
![ironworker rest http api iron io dev center 2014-08-05 17-28-46 2014-08-05 17-28-55](https://cloud.githubusercontent.com/assets/1712162/3820928/bf4dfc0c-1d00-11e4-8887-9f7ac269852a.png)