Add mockGenerator parameter to interface constructor

Hi guys,

When i try to instanciate an interface mock, i got the following error:

```
Error E_NOTICE in /[...]/MyTest.php on line 71, generated by file /[...]/vendor/atoum/atoum/classes/mock/generator.php(182) : eval()'d code on line 25:
Undefined variable: mockController
```

This PR add the mockGenerator argument to interfaces constructors and fix it.

Thanks