Bug fix (filters.py): Remove to_json from filters and move it to helpers.py.
Remove function (helpers.py): Remove to_jsonp and merge its functionalities to to_json.
Add links (index.html): Add html links that links to /json (to display application/json data) and /json?callback=JSONP (to display application/javascript data).
Remove function (controllers.py): Remove jsonp() since it returns the same data as json(), only that it requires a bit of manipulation when contains query strings.
Remove tuple (urls.py): Remove the tuple containing the json() funciton. Having a query string will do a different processing.