unicode support (search cyrillic, ...) #91
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Hi. I've made this modifications for your excellent library to work not only with English (you check character codes to know if it's even alphanumeric). It became a bit slower, but now I let JS/regexp engines decide, if it's a letter. And to check if it's "upper" I need to check "uppercase !== lowercase" for cases of languages where there's no upper cases at all.