Added downloading to Hyperpartisan news detection
Thank you @ghomasHudson for making our dataset available! This is great! The test passes since #527 :)
Following the discussion on Slack and #349, I've updated the hyperpartisan dataset to pull directly from Zenodo rather than manual install, which should make this dataset much more accessible. Many thanks to @johanneskiesel !

Currently doesn't pass `test_load_real_dataset` - I'm using `self.config.name` which is `default` in this test. Might be related to #474