Fix issue #14 and #41 and bring dependencies up to date

Fix issue #41. The Type Provider should no longer return an extra blank row with the data as it did before.
Fix issue #14 and related behaviour. We are now better at handling casting of data to the detected data type if there are rows which have data of different data types.
Both above fixes were contributed by new contributor Matthew Dupont. His contributions are very much appreciated.
Both fixes, but especially for #41, can break existing code logic. Please test your code after upgrading to this version.

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