Jaconv

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- Fix bugs (alphabet2kana, kana2alphabet) thanks letuananh

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- Fix bug (kana2alphabet) thanks kokimame
- Support Python 3.6

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- Fix bugs (alphabet2kana, kana2alphabet)

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- Change module name jctconv -> jaconv
- Add alphabet and hiragana interconvert (alphabet2kana, kana2alphabet)

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- Support Windows
- Support Python 3.5

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- Add some Japanese characters to convert table (ゝゞ・「」。、)
- Decresing memory usage
- Some function names are deprecated (hankaku2zenkaku, zenkaku2hankaku, H2K, H2hK, K2H)