Improve PyBetaFace results

### Need
PyBetaFace API gives very poor results:

- When it should recognize Andrei: 

```bash
INFO: Received matches from BetaFace: {'diana@amilab.ro': 0.606, 'andrei@amilab.ro': 0.594, 'alin@amilab.ro': 0.603}
INFO: Out of the matches returned by BetaFace, the maximum confidence is only 0.61 (should have been at least 0.75)
```

- When it should recognize Diana:

```bash
INFO: Received matches from BetaFace: {'diana@amilab.ro': 0.7}
INFO: Out of the matches returned by BetaFace, the maximum confidence is only 0.70 (should have been at least 0.75)
```

### Deliverables
Train PyBetaFace with more images of Andrei, Diana and other samples.

### Solution
- [x] dump acquisition
- [x] add script that trains PyBetaFace with the acquired images

### Notes
None for now.