Made _train and _untrain public so that tokens can be bulk trained an…#2

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joeynovak wants to merge 3 commits intoafonsof:masterfrom joeynovak:master

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Commits on Oct 27, 2017

Made _train and _untrain public so that tokens can be bulk trained and untrained and move tokenization outside of the library.
joeynovak
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Whoops, forgot to make Train() a public method.
joeynovak
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Refactored Classify into a seperate method for tokenized vs not tokenized.
joeynovak
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