Build fat executable

When running executable (built with 'PenTest Release' Scheme)

```
ml@nicky ~/code $ /Users/ml/Desktop/test/PenTest ; exit;
dyld: Library not loaded: @rpath/KituraWebSocket.framework/Versions/A/KituraWebSocket
  Referenced from: /Users/ml/Desktop/test/PenTest
  Reason: image not found
Abort trap: 6
```