Do not load the mocking backend when executing SWT specs

This Pull requests makes it in a way that the mock backend isn't even loaded when the SWT specs are executed (as it should be imo). So there now can also be no more 'cheating specs' like the dialog spec, that just stubbed the backend to be Mock ;-)

See the commits for more information on details. Will merge this when Travis passes (this is a PRFTS - Pull Request for Travis Safety) and also a little PSA :-)

Cheers,
Tobi