Pymlask

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- Support mecab and mecab-python3 simultaneously (thanks phuongdo)

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- Fix bugs about emotion pattern matching (thanks brunotoshio)
- Fix bug about activation count (thanks brunotoshio)

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- Use MeCab.Tagger().parse() instead of MeCab.Tagger().parseToNode

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- The 712 emotional words from Kanjou kotoba erabi jiten (感情ことば選び辞典) are newly added
- Support Python 3.7
- Unsupport Python 2.6 and 3.3

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- Fix bugs about MeCab (thanks Kensuke-Mitsuzawa)
- Delete install_requires

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- Fix many bugs
- Add some emotional words
- Delete invalid words
- Correct typo