run_tf_glue works with all tasks
Slightly changed the logic of the DataProcessor so that it can handle GLUE data coming from the `tensorflow_datasets` package.

Updated the script so that all tasks are now available, with regression tasks (STS-B) as well as all classification tasks.

Should update the import into PyTorch that currently tests if two sentences are paraphrases of each other; as the glue script handles all GLUE tasks it should be a different test.