[MRG] Added metrics support for multiclass-multioutput classification

Fix for #3453 
Ping @arjoly . Added support for `zero_one_loss` and `accuracy_score`

Could you please add more tests such as:

```
zero_one_loss([[1, 2], [3, 4]], [[2, 1], [3, 4]])
zero_one_loss([[1, 2], [3, 4]], [[2, 1], [4, 3]])
zero_one_loss([[-1, 2], [3, 4]], [[1, 2], [3, 4]])
zero_one_loss([[-1, 2], [3, 4]], [[1, 1], [3, 4]])
```

I am not sure that the current implementation actually make sense.