Addition of new Stylometric measres

[DonaldTsang]

Here are some common repos that uses stylometry as as a base for their code:

• https://github.com/evllabs/JGAAP (182 stars, Java)
• https://github.com/jpotts18/stylometry (84 stars, Python)
• https://github.com/calaylin/CodeStylometry (54 stars, Java)
• https://github.com/dykang/PASTEL (12 stars, Python)
• https://github.com/worldwise001/stylometry (10 stars, Python)
• https://github.com/pagea/unstyle (8 stars, Python)
• https://github.com/usc-isi-i2/dig-stylometry (5 stars, Python)
• https://github.com/spencermwoo/anonymouth (4 stars, Java)
• https://github.com/paper82/pylometry (4 stars, Python)
• https://github.com/rakshithShetty/A4NT-author-masking (3 stars, Python)
• https://github.com/a-coles/SMS-Stylometry (3 stars, Python)
• https://github.com/Avielstein/StylometrySetup (3 stars, C++)
• https://github.com/lnmaurer/StyleTool (3 stars, Ruby)

Would like to discuss what features each repo has that is missing from stylometry.