Optionally allow GET requests to reach controllers

[pointybeard]

Currently there is a hard 'no' on GET requests which prevents them from getting to the controller. Instead, in the Controller event, it drops out and lets Symphony handle it internally before the JSON result is then rendered. See:

api_framework/events/event.controller.php

Line 42 in 46b86ef

if ($request->getMethod() == 'GET') {

It would be nice if there was a way to indicate that GET requests need to go through to the controller. Perhaps it's as simple as checking for a get() method on the controller like the other HTTP request methods do. The logic for this could go here:

api_framework/events/event.controller.php

Lines 83 to 86 in 46b86ef

	// Throw an exception if it cannot be located.
	if (!class_exists($controllerPath)) {
	throw new Lib\Exceptions\ControllerNotFoundException($controllerPath);
	}

[pointybeard]

Also need a way for a controller to signal that GET requests should or should not fall through to the Symphony core renderer.