Fix bundle namespace

From what I understand of Composer's autoload feature (which admittedly is not much), I think the namespace needs to be changed to match the new `psr-0` location set here:

https://github.com/LordBaine2000/TuupolaJEditableBundle/blob/master/composer.json#L20

As it is now, I'm getting a fatal error on `composer update`:

```
PHP Fatal error:  Class 'Tuupola\JEditableBundle\TuupolaJEditableBundle' not found in /project/app/AppKernel.php on line 26
```