Removed express deprecated app.configure. Partial fix for #315

Partial fix for https://github.com/OpenUserJs/OpenUserJS.org/issues/315#issuecomment-53265435

Got warnings after updating to the latest Express version:
```
express deprecated app.configure: Check app.get('env') in an if statement app.js:44:5
```
After reading http://expressjs.com/3x/api.html#app.configure it appears that this code isn't even necessary.

One step closer to Express 4.0 :smile: