Emoji

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* Update translations to unicode release-43-1
* Include "derived annotations"-translations from unicode CLDR
* Fix translations for emoji that have multiple forms with/out \uFE0F (Fixes Partially missing languages 272 )
* Remove multiple underscore __, ___, ____ and _-_ from translations

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* Extract aliases from cheat sheet and youtube
* Fix extracting translations from emojiterra
* Update EMOJI_DATA with new aliases and translations

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* Added new function purely_emoji() | Check if a string contains only emojis

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* Fix Malformed zero width joiner (\u200d) causes IndexError

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* Added support for Multi-person skintones
* Removed support for Python 2, 3.4, 3.5
* The logic from demojize() is moved to two separate private function tokenize() and filter_tokens() in a new file emoji/tokenizer.py
* A new public function analyze() is available and that supports the multi-person skintones

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* Added Japanese and Korean