Treat HAN, KATAKANA, HIRAGANA, and HANGUL as one "CJK" script since
splitting them apart actually makes language identification harder due
to Unicode Han unification.  Also, don't treat COMMON nor INHERITED
script characters as a change in script.
Don't tokenize on all non-Unicode-letters, just tokenize on whitespace.
Pig sample/test code and data demonstrating the combination of
ScriptTagger and LanguageIdentifier to identify, in a single document,
multiple languages which differ by script.