No support for Arabic language (cp1256)

[strrchr]

I just found a test for Arabic.
https://github.com/chardet/chardet/blob/master/tests/windows-1256-arabic/_chromium_windows-1256_with_no_encoding_specified.html

According to this link, cp1256 is also an important encoding.
http://w3techs.com/technologies/overview/character_encoding/all

[dan-blanchard]

@sigmavirus24 and I don't have much time to dedicate to chardet, so things have been stagnant for a bit. I've had a branch in the backlog for a bit that will add the ability to train new language models, and once we have that, we can attempt to train up models for some of the missing languages and codecs.

[dan-blanchard]

#99 Add support for Arabic, but it's not quite ready for prime time yet.