adding support for generating test methods for classes that already exis...

It would be a great feature if the generator could create a test class with all the methods that exist in a particular class.
For example if I have a previously created controller called `UserController` and it has the methods `index`, `edit` and `update` I would simply write:

`php artisan generate:test UserControllerTest`

and the reflector would scan if a class called `UserController` exists and extract its methods. It would than generate a template like this

```php
<?php 

class UserControllerTest extends TestCase {

	public function testIndex()
	{

	}

	public function testEdit()
	{

	}

	public function testUpdate()
	{

	}

}
```

This would be useful for controllers that are not created with generator and have a lot of methods.