criteria:  Misclassification

There are two ways to use the API:

To use the criteria:
```python
raw_advs, clipped_advs, success = attack(fmodel, data,  criterion=Misclassification(label), epsilons=args.eps)
```

and without using the criteria: 
```python
raw_advs, clipped_advs, success = attack(fmodel, data,  label, epsilons=args.eps)
```

What is the difference? 
Unfortunately,  haven't found examples anywhere. 
