Add query parameters in sandbox request URL

This PR adds query parameters to request URL displayed after a sandbox try :

![before](https://cloud.githubusercontent.com/assets/663607/4043089/70d51030-2d0c-11e4-9fd9-eead7d43c53e.jpg)
![after](https://cloud.githubusercontent.com/assets/663607/4043088/70cba9aa-2d0c-11e4-89ce-10f324273f11.jpg)

Query authentication is still working :
![api_key](https://cloud.githubusercontent.com/assets/663607/4043126/099bfffe-2d0d-11e4-8a6c-dc7a7ee04a83.jpg)