Documenting the optional default value parameter

[jklein]

Each of these:

$app->request->get()
$app->request->post()
$app->request->put()

Accepts an optional second parameter to specific a default value. This is currently undocumented, so I documented it. Evidence:

https://github.com/codeguy/Slim/blob/master/Slim/Http/Request.php#L215