make the bulk upload view asynchronous

http://manage.dimagi.com/default.asp?107041

![image](https://cloud.githubusercontent.com/assets/66555/2657981/a521aeec-c002-11e3-931b-61761843b51a.png)

![image](https://cloud.githubusercontent.com/assets/66555/2657969/867b6460-c002-11e3-839c-18b858794c94.png)