Bewest/fix form view url

Based on the information I have available on hand, this should help fix https://github.com/jpf/TwilioSheet/issues/3#issuecomment-34660910

I've tested in locally on my console to make sure some data gets generated, and running the `app.py` locally says that it works:

![image](https://f.cloud.github.com/assets/394179/2479041/028a52a2-b08e-11e3-9ff4-94436ce7c2d0.png)