Allow custom split names in text dataset
CONTRIBUTOR
Awesome! This will make the behaviour much more intuitive for some non-standard code.

Thanks!
2020-10-30T13:46:45Z
https://github.com/huggingface/datasets/pull/776#issuecomment-719561894
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2020-10-30T13:46:45Z
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The `text` dataset used to return only splits like train, test and validation. Other splits were ignored.
Now any split name is allowed.

I did the same for `json`, `pandas` and `csv`

Fix #735 