Enable WSGI application traceback debugger

![screen shot 2013-11-05 at 11 24 55 pm](https://f.cloud.github.com/assets/47926/1476868/25e934a4-4651-11e3-9ec6-411a1a28497d.png)


![screen shot 2013-11-05 at 11 25 24 pm](https://f.cloud.github.com/assets/47926/1476825/70e9561a-4650-11e3-8322-1ed3bf698ba4.png)