Underthesea

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* Rename word_sent function to word_tokenize
* Refactor version control in setup.py file and __init__.py file
* Update documentation badge url

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* New feature: aspect sentiment analysis
* Integrate with languageflow 1.1.6
* Fix bug tokenize string with '=' (159)

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* New feature: named entity recognition
* Refactor and update model for word_sent, pos_tag, chunking

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* New feature: text classification
* [bug] Fix Text error
* [doc] Add facebook link

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* Add live demo: https://underthesea.herokuapp.com/

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* Add dictionary