JSON script
{'login': 'jplu', 'id': 959590, 'node_id': 'MDQ6VXNlcjk1OTU5MA==', 'avatar_url': 'https://avatars.githubusercontent.com/u/959590?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/jplu', 'html_url': 'https://github.com/jplu', 'followers_url': 'https://api.github.com/users/jplu/followers', 'following_url': 'https://api.github.com/users/jplu/following{/other_user}', 'gists_url': 'https://api.github.com/users/jplu/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/jplu/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/jplu/subscriptions', 'organizations_url': 'https://api.github.com/users/jplu/orgs', 'repos_url': 'https://api.github.com/users/jplu/repos', 'events_url': 'https://api.github.com/users/jplu/events{/privacy}', 'received_events_url': 'https://api.github.com/users/jplu/received_events', 'type': 'User', 'site_admin': False}
[]
[]
The tests for the Wikipedia dataset do not pass anymore with the error:
```
To be able to use this dataset, you need to install the following dependencies ['mwparserfromhell'] using 'pip install mwparserfromhell' for instance'
``` This was an issue on master. You can just rebase from master. Perfect! Indeed, it worked^^ Thanks @lhoestq  Currently the dummy_data tests are always green because in a PR the dataset is not yet synchronized with aws. This PR fixes this: https://github.com/huggingface/nlp/pull/140 . 

Could you test `json` locally or wait until the PR: https://github.com/huggingface/nlp/pull/140 is merged ? :-)  Ok, I will wait #140 to be merged and then rebase :) 
Add a JSONS script to read JSON datasets from files.
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