Add controller provider and assets

## To test:

Add this branch to the require field of your `composer.json`:
```
php composer.phar update useallfive/doctrine-web-console dev-web-console
```

Mount the controller to the /console path.
```php
$this->mount(
        '/console',
        new \UseAllFive\DoctrineWebConsole\ConsoleControllerProvider()
    )
;
```

Visit the /console URL of your app and verify that you can use the doctrine console.