ChicagoBoss/ChicagoBoss — pull request #506 by mihawk (2014-09-26 09:01:32+00:00)
Title: be abble to send a json response with a 404 handler

use case rest api:
be abble to send a json response without to create a template, shorcut the rendering.

```
route file:
{404, [{controller, "v1"}, {action, "not_found"}]}.
```

```erlang
in controller v1
not_found('GET', _) ->
{404, jsx:encode([{error, <<"Invalid Request">>}]), [{"Content-type","application/json"}]}.
```