Implement @ReceiverAction for issue #851

As i got some free time today, i decided to do another contribution to AA. :)

I implemented the @ReceiverAction annotation suggested in https://github.com/excilys/androidannotations/issues/851.

The code is based on the `ServiceActionHandler`.

This class
```java
@EReceiver
public class MyReceiver extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent intent) {

	}

	@ReceiverAction("MyAction")
	public void doSomething() {
		// Your code ...
	}

	@ReceiverAction(DownloadManager.ACTION_DOWNLOAD_COMPLETE)
	public void onDownloadComplete(@ReceiverAction.Extra(DownloadManager.EXTRA_DOWNLOAD_ID) long extraDownloadId) {
		// Your code ...
	}

	@ReceiverAction("anotherAction")
	public void helloWorld(@ReceiverAction.Extra("hello_world") String heyWorldyWorld) {
		// Your code ...
	}
}
``` 

genereates the following code
```java
public final class MyReceiver_
    extends MyReceiver
{

    public final static String ACTION_HELLO_WORLD = "anotherAction";
    private Context context_;
    public final static String HELLO_WORLD_EXTRA = "hello_world";
    public final static String ACTION_ON_DOWNLOAD_COMPLETE = "android.intent.action.DOWNLOAD_COMPLETE";
    public final static String EXTRA_DOWNLOAD_ID_EXTRA = "extra_download_id";
    public final static String ACTION_DO_SOMETHING = "MyAction";

    @Override
    public void onReceive(Context context, Intent intent) {
        context_ = context;
        init_();
        super.onReceive(context, intent);
        String action = intent.getAction();
        if (ACTION_HELLO_WORLD.equals(action)) {
            Bundle extras = intent.getExtras();
            if (extras!= null) {
                String hello_worldExtra = extras.getString(HELLO_WORLD_EXTRA);
                super.helloWorld(hello_worldExtra);
            }
            return ;
        }
        if (ACTION_ON_DOWNLOAD_COMPLETE.equals(action)) {
            Bundle extras = intent.getExtras();
            if (extras!= null) {
                long extra_download_idExtra = extras.getLong(EXTRA_DOWNLOAD_ID_EXTRA);
                super.onDownloadComplete(extra_download_idExtra);
            }
            return ;
        }
        if (ACTION_DO_SOMETHING.equals(action)) {
            super.doSomething();
            return ;
        }
    }

    private void init_() {
    }

}

```