Zend Framework 2 Integration

Response for issue #30

Instructions:

- add Whoops as a module to you app (/vendor/Whoops)
- Whoops must be the first module:

```php
'modules' => array(
        'Whoops',
        'Application'
   )
```
- move Module.php from /Whoops/Provider/Zend/Module.php to /Whoops/Module.php
- use optional configurations in your controller config: 

```php
return array(
    'view_manager' => array(
        'display_not_found_reason' => true,
        'display_exceptions' => true,
        'json_exceptions' => array(
            'display' => true,
            'ajax_only' => true,
            'show_trace' => true
        )
    ),
);
```

- NOTE: ob_clean(); is used to remove previous output, so you may use ob_start(); at the beginning of your app (index.php)