3.0- PaginatorHelper url generation

it appears that when there is a query string in the url of the pagination helper like this : 
![capture](https://cloud.githubusercontent.com/assets/4977112/4646659/463c9808-5475-11e4-9589-67966663c3ce.PNG)

The parameters are lost when moving to page 2
![capture2](https://cloud.githubusercontent.com/assets/4977112/4646665/5b6fe068-5475-11e4-9c57-e91786d11111.PNG)

This PR corrects this problem as shown bellow
![capture3](https://cloud.githubusercontent.com/assets/4977112/4646681/7faa4130-5475-11e4-8c16-4df4cb8e0e78.PNG)