mismatch keys of glue tasks

```
>>> from transformers import glue_output_modes, glue_processors, glue_tasks_num_labels, glue_compute_metrics``

>>> glue_tasks_num_labels.keys()
dict_keys(['cola', 'mnli', 'mrpc', 'sst-2', 'sts-b', 'qqp', 'qnli', 'rte', 'wnli'])

>>> glue_output_modes.keys()
dict_keys(['cola', 'mnli', 'mnli-mm', 'mrpc', 'sst-2', 'sts-b', 'qqp', 'qnli', 'rte', 'wnli'])

>>> glue_processors.keys()
dict_keys(['cola', 'mnli', 'mnli-mm', 'mrpc', 'sst-2', 'sts-b', 'qqp', 'qnli', 'rte', 'wnli'])
```

and ``glue_compute_metrics`` has ``task_name`` restrictions:

```['cola', 'sst-2', 'mrpc',  'sts-b', 'qqp', 'mnli', 'mnli-mm',  'qnli', 'rte', 'wnli', 'hans']```

Why are these task names inconsistent?
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