Added metadata and correct splits for swda.
{'login': 'gmihaila', 'id': 22454783, 'node_id': 'MDQ6VXNlcjIyNDU0Nzgz', 'avatar_url': 'https://avatars.githubusercontent.com/u/22454783?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/gmihaila', 'html_url': 'https://github.com/gmihaila', 'followers_url': 'https://api.github.com/users/gmihaila/followers', 'following_url': 'https://api.github.com/users/gmihaila/following{/other_user}', 'gists_url': 'https://api.github.com/users/gmihaila/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/gmihaila/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/gmihaila/subscriptions', 'organizations_url': 'https://api.github.com/users/gmihaila/orgs', 'repos_url': 'https://api.github.com/users/gmihaila/repos', 'events_url': 'https://api.github.com/users/gmihaila/events{/privacy}', 'received_events_url': 'https://api.github.com/users/gmihaila/received_events', 'type': 'User', 'site_admin': False}
[]
[]
I will push updates tomorrow. @lhoestq thank you for your comments! I went ahead and fixed the code 😃. Please let me know if I missed anything.
Switchboard Dialog Act Corpus

I made some changes following  @bhavitvyamalik recommendation in #1678:

* Contains all metadata.
* Used official implementation from the [/swda](https://github.com/cgpotts/swda) repo.
* Add official train and test splits used in [Stolcke et al. (2000)](https://web.stanford.edu/~jurafsky/ws97) and validation split used in [Probabilistic-RNN-DA-Classifier](https://github.com/NathanDuran/Probabilistic-RNN-DA-Classifier).
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