Add spanish billion words corpus
CONTRIBUTOR
Thank you for your feedback! I've reduced the dummy data size to 2KB.

I had to rebase to fix `RemoteDatasetTest` fails, sorry about the 80 commits. 
I could create a new clean PR if you prefer.
2020-12-11T00:38:37Z
https://github.com/huggingface/datasets/pull/1347#issuecomment-742890185
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CONTRIBUTOR
I have seen that in similar cases you have suggested to other contributors to create another branch and another PR, so I will do that.
2020-12-11T11:15:28Z
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MEMBER
Yes thank you !
2020-12-11T11:16:37Z
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CONTRIBUTOR
The new PR is #1476 :)
2020-12-11T11:26:39Z
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Add an unannotated Spanish corpus of nearly 1.5 billion words, compiled from different resources from the web.