Add \Phalcon\Mvc\Amf

Bootstrap
```php
    $di = new \Phalcon\DI\FactoryDefault();
    $application = new \Phalcon\Mvc\Amf($di);
    echo $application->handle()->getContent();
```
Controller
```php
<?php

class IndexController extends ControllerBase {

	public function indexAction() {
	}
	
	public function helloAction($message) {
		$data = $message->getData(); // hello
		$responseMessage = new \Phalcon\Amf\Message();
		$responseMessage->setData(array(123, 456));
		$responseMessage->setTarget($message->getResponse() . \Phalcon\Amf::CLIENT_SUCCESS_METHOD);
		$responseMessage->setResponse('null');
		
		$serializer = new \Phalcon\Amf\Serializer($responseMessage);		
		$this->response->setContent($serializer->render());
	}
}
```
```as3
	var connection:NetConnection = new NetConnection();
	connection.objectEncoding = ObjectEncoding.AMF3; //选择AMF3协议  
	connection.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
				
	var responder:Responder = new Responder(onResult, onFault);
	connection.connect("http://localhost/");
	connection.call("index/test", responder, "hello");
```