Support Unicode

[sbadithe]

As a user, I wish NLP Primitives had the ability to handle unicode text.

Currently, Unicode text is not correctly handled by regexes in nlp_primitives.

For example, Àbc is not recognized as a title word by TitleWordCount (Abc is).

[gsheni]

@sbadithe Is it possible to make a pytest fixture and have it be used by all the NL primitives? That way if we add more NL primitives in the future, we can make sure they support unicode.