Variety of response classes (Json, Csv, etc.)

[peterhorne]

If the user sets body to an array instead of a string (via __constructor, or $response['body']) then the array should be converted to a json string and the appropriate headers should be set.

[peterhorne]

Now that Elmer\Response handles __constructor arguments by type rather than position this is not possible to implement. Perhaps custom response objects that extend Elmer\Response would work though?

<?php
$app->get('/json', function() {
    return new JsonResponse($users);
});

$app->get('/csv', function() {
    return new CsvResponse($users);
});

[peterhorne]

Naming of classes should be under the Elmer\Responses namespace:

<?php
use Elmer\Responses\Json;
use Elmer\Responses\Csv
;
$app->get('/json', function() {
    return new Json($users);
});

$app->get('/csv', function() {
    return new Csv($users);
});

I suggest moving the current response class Elmer\Response into the responses namespace as well. Elmer\Responses\Response or Elmer\Responses\Http