upload url can be config

![image](https://cloud.githubusercontent.com/assets/1147375/4592184/7205c71c-5078-11e4-8609-3b97f935c351.png)

![image](https://cloud.githubusercontent.com/assets/1147375/4592187/7e0a997a-5078-11e4-9c00-fe8b5c747485.png)